#23972 Prepare 7.24.0 snapshot

PR checklist

• Read the contribution guidelines.
• Run the following to build the project and update samples:

  ./mvnw clean package || exit
  ./bin/generate-samples.sh ./bin/configs/*.yaml || exit
  ./bin/utils/export_docs_generators.sh || exit
  

  (For Windows users, please run the script in WSL)
  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  IMPORTANT: Do NOT purge/delete any folders/files (e.g. tests) when regenerating the samples as manually written tests may be removed.
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

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Summary by cubic

Prepare the 7.24.0-SNAPSHOT release: bumped project versions and regenerated samples. Docs now reference 7.23.0 as the latest stable, with updated install commands and plugin examples.

• Dependencies

  • Set project and module versions to 7.24.0-SNAPSHOT.
  • Updated docs and README to point openapi-generator-cli downloads/commands to 7.23.0.
  • Updated example versions for openapi-generator-maven-plugin and org.openapi.generator Gradle plugin to 7.23.0.
  • Regenerated sample clients with Generator version 7.24.0-SNAPSHOT.

• Refactors

  • Added modules/openapi-generator-mill-plugin/pom.xml to the release version update script.