Bump org.apache.maven.plugins:maven-pmd-plugin from 3.20.0 to 3.21.2 (#105)

Bumps [org.apache.maven.plugins:maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.20.0 to 3.21.2.
- [Release notes](https://github.com/apache/maven-pmd-plugin/releases)
- [Commits](https://github.com/apache/maven-pmd-plugin/compare/maven-pmd-plugin-3.20.0...maven-pmd-plugin-3.21.2)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-pmd-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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