Bump maven-pmd-plugin from 3.14.0 to 3.15.0

Bumps [maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/apache/maven-pmd-plugin/releases)
- [Commits](apache/maven-pmd-plugin@maven-pmd-plugin-3.14.0...maven-pmd-plugin-3.15.0)

---
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] <[email protected]>

pom.xml

@@ -39,7 +39,7 @@
     <json-unit-fluent.version>2.28.0</json-unit-fluent.version>
 
     <!-- Maven plug-in versions -->
-    <maven-pmd-plugin.version>3.14.0</maven-pmd-plugin.version>
+    <maven-pmd-plugin.version>3.15.0</maven-pmd-plugin.version>
     <pmd.version>6.38.0</pmd.version>
     <maven-checkstyle-plugin.version>3.1.2</maven-checkstyle-plugin.version>
     <checkstyle.version>9.0</checkstyle.version>