Bump commons.pmd-impl.version from 6.39.0 to 6.40.0

Bumps `commons.pmd-impl.version` from 6.39.0 to 6.40.0.

Updates `pmd-core` from 6.39.0 to 6.40.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/master/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/6.39.0...pmd_releases/6.40.0)

Updates `pmd-java` from 6.39.0 to 6.40.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/master/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/6.39.0...pmd_releases/6.40.0)

---
updated-dependencies:
- dependency-name: net.sourceforge.pmd:pmd-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: net.sourceforge.pmd:pmd-java
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -172,7 +172,7 @@
     <checkstyle.resourceExcludes>LICENSE.txt, NOTICE.txt, **/maven-archiver/pom.properties</checkstyle.resourceExcludes>
 
     <commons.pmd.version>3.15.0</commons.pmd.version>
-    <commons.pmd-impl.version>6.39.0</commons.pmd-impl.version>
+    <commons.pmd-impl.version>6.40.0</commons.pmd-impl.version>
     <commons.jacoco.version>0.8.7</commons.jacoco.version>
     <commons.spotbugs.version>4.3.0</commons.spotbugs.version>
     <commons.japicmp.version>0.15.3</commons.japicmp.version>