Add flatten-maven-plugin to querydsl-bom

[dodgex]

This PR adds the flatten-maven-plugin to the querydsl-bom to not have it referene the project parent (querydsl-root) when published. This avoids unexpected dependency management overrides by the dependencyManagement block in the project parent when using the bom.

Fixes #1788

[dodgex]

With this changes, the generated bom would look like this:

I kept organization, licenses, developers, contributors and scm tags, but they could be removed too if not desired.

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <groupId>io.github.openfeign.querydsl</groupId>
  <artifactId>querydsl-bom</artifactId>
  <version>7.3-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>QueryDSL (Bill Of Materials)</name>
  <description>Generated Bom</description>
  <organization>
    <name>OpenFeign</name>
    <url>https://github.com/openfeign</url>
  </organization>
  <licenses>
    <license>
      <name>Apache License, Version 2.0</name>
      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
      <distribution>repo</distribution>
    </license>
  </licenses>
  <developers>
    <developer>
      <id>velo</id>
      <name>Marvin Herman Froeder</name>
    </developer>
  </developers>
  <contributors>
    <contributor>
      <name>Timo Westkämper</name>
      <organization>Mysema Ltd</organization>
    </contributor>
    <contributor>
      <name>Samppa Saarela</name>
      <organization>Mysema Ltd</organization>
    </contributor>
    <contributor>
      <name>Vesa Marttila</name>
      <organization>Mysema Ltd</organization>
    </contributor>
    <contributor>
      <name>Lassi Immonen</name>
      <organization>Mysema Ltd</organization>
    </contributor>
    <contributor>
      <name>Ruben Dijkstra</name>
    </contributor>
    <contributor>
      <name>John Tims</name>
    </contributor>
    <contributor>
      <name>Robert Bain</name>
    </contributor>
    <contributor>
      <name>Jan-Willem Gmelig Meyling</name>
    </contributor>
  </contributors>
  <scm>
    <connection>scm:git:git@github.com:openfeign/querydsl.git/querydsl-bom</connection>
    <developerConnection>scm:git:git@github.com:openfeign/querydsl.git/querydsl-bom</developerConnection>
    <url>http://github.com/openfeign/querydsl/querydsl-bom</url>
  </scm>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-core</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-codegen-utils</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-codegen</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-spatial</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-sql</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-sql-codegen</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-maven-plugin</artifactId>
        <version>7.3-SNAPSHOT</version>
        <type>maven-plugin</type>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-jpa</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-jpa-codegen</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-kotlin-codegen</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-ksp-codegen</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-guava</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-collections</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-sql-spatial</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-sql-spring</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-sql-json</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-r2dbc</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-mongodb</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-scala</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-kotlin</artifactId>
        <version>7.3-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>general</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>hibernate</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>jakarta</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>jdo</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>jpa</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>morphia</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>roo</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-apt</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>general-one</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-jpa</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>apt-one-jar</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-jpa</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>apt-hibernate-one-jar</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-jpa</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>apt</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-mongodb</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>apt-one-jar</classifier>
      </dependency>
      <dependency>
        <groupId>io.github.openfeign.querydsl</groupId>
        <artifactId>querydsl-mongodb</artifactId>
        <version>7.3-SNAPSHOT</version>
        <classifier>apt</classifier>
      </dependency>
    </dependencies>
  </dependencyManagement>
</project>

[velo]

can flatten also remove parent pom?