Make bytes fields work similarly to string in (required) repeated and map fields

[alexander-yevsyukov]

This PR makes code generation for the fields of the bytes type work similarly to strings when they are (required) in repeated or map fields.

Other notable changes

• config was also updated.

[Copilot]

Pull request overview

This PR updates the Java validation code generator so that (required) semantics for bytes fields inside repeated and map fields match the existing behavior for string: empty ByteString values are treated as “missing” and trigger a violation.

Changes:

• Extend (required) collection-element “missing” predicate generation to support bytes (ByteString.isEmpty()).
• Add new proto fixture message for map<string, bytes> with (required) = true.
• Add integration tests covering (required) for repeated bytes and map values of bytes, including mixed empty/non-empty cases.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
version.gradle.kts	Bumps published Validation version snapshot.
tests/validating/src/testFixtures/proto/spine/test/tools/validate/required.proto	Adds a required map<string, bytes> fixture message.
tests/validating/src/test/kotlin/io/spine/test/options/required/RequiredRepeatedBytesITest.kt	Adds integration tests for required repeated bytes behavior.
tests/validating/src/test/kotlin/io/spine/test/options/required/RequiredMapWithBytesITest.kt	Adds integration tests for required map with bytes values behavior.
java/src/main/kotlin/io/spine/tools/validation/java/generate/option/RequiredGenerator.kt	Implements per-element “missing” predicate for bytes via ByteString::isEmpty.
docs/dependencies/pom.xml	Updates documented dependency versions to the new snapshots.
docs/dependencies/dependencies.md	Updates generated dependency report version headers/timestamps.
docs/content/docs/validation/user/01-getting-started/adding-to-build.md	Updates plugin version in user documentation.
docs/content/docs/validation/developer/build-and-release.md	Updates the documented published version.
buildSrc/src/main/kotlin/io/spine/dependency/local/Validation.kt	Bumps local Validation runtime dependency version.
buildSrc/src/main/kotlin/io/spine/dependency/local/Time.kt	Bumps local Spine Time dependency version.
buildSrc/src/main/kotlin/io/spine/dependency/local/Compiler.kt	Bumps local Compiler dependency version(s).
.claude/agents/dependency-audit.md	Updates the agent configuration (model + guidance).
.agents/skills/dependency-audit/SKILL.md	Updates the dependency-audit skill procedure to prefer unified diff + batching.

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