Bump @nestjs/core and @openapitools/openapi-generator-cli

Bumps [@nestjs/core](https://github.com/nestjs/nest/tree/HEAD/packages/core) to 11.1.18 and updates ancestor dependency [@openapitools/openapi-generator-cli](https://github.com/OpenAPITools/openapi-generator-cli). These dependencies need to be updated together.


Updates `@nestjs/core` from 11.1.12 to 11.1.18
- [Release notes](https://github.com/nestjs/nest/releases)
- [Commits](https://github.com/nestjs/nest/commits/v11.1.18/packages/core)

Updates `@openapitools/openapi-generator-cli` from 2.28.0 to 2.31.1
- [Release notes](https://github.com/OpenAPITools/openapi-generator-cli/releases)
- [Commits](OpenAPITools/openapi-generator-cli@v2.28.0...v2.31.1)

---
updated-dependencies:
- dependency-name: "@nestjs/core"
  dependency-version: 11.1.18
  dependency-type: indirect
- dependency-name: "@openapitools/openapi-generator-cli"
  dependency-version: 2.31.1
  dependency-type: direct:development
...

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Author: dependabot[bot]