maven: bump maven-pmd-plugin from 3.19.0 to 3.20.0

Bumps [maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.19.0 to 3.20.0.
- [Release notes](https://github.com/apache/maven-pmd-plugin/releases)
- [Commits](apache/maven-pmd-plugin@maven-pmd-plugin-3.19.0...maven-pmd-plugin-3.20.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -81,7 +81,7 @@
         <maven.gpg.plugin.version>3.0.1</maven.gpg.plugin.version>
         <maven.javadoc.plugin.version>3.4.1</maven.javadoc.plugin.version>
         <maven.jxr.plugin.verision>3.3.0</maven.jxr.plugin.verision>
-        <maven.pmd.plugin.version>3.19.0</maven.pmd.plugin.version>
+        <maven.pmd.plugin.version>3.20.0</maven.pmd.plugin.version>
         <maven.site.plugin.version>3.12.1</maven.site.plugin.version>
         <maven.source.plugin.version>3.2.1</maven.source.plugin.version>
         <maven.surefire.plugin.version>3.0.0-M8</maven.surefire.plugin.version>