Bump pmdVersion from 7.8.0 to 7.9.0 (jenkinsci#1530)

Bumps `pmdVersion` from 7.8.0 to 7.9.0.

Updates `net.sourceforge.pmd:pmd-core` from 7.8.0 to 7.9.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/main/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/7.8.0...pmd_releases/7.9.0)

Updates `net.sourceforge.pmd:pmd-java` from 7.8.0 to 7.9.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/main/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/7.8.0...pmd_releases/7.9.0)

Updates `net.sourceforge.pmd:pmd-javascript` from 7.8.0 to 7.9.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/main/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/7.8.0...pmd_releases/7.9.0)

Updates `net.sourceforge.pmd:pmd-jsp` from 7.8.0 to 7.9.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Changelog](https://github.com/pmd/pmd/blob/main/docs/render_release_notes.rb)
- [Commits](pmd/pmd@pmd_releases/7.8.0...pmd_releases/7.9.0)

---
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
- dependency-name: net.sourceforge.pmd:pmd-javascript
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: net.sourceforge.pmd:pmd-jsp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -42,7 +42,7 @@
     <!-- Plugin intentionally does not deliver javadoc. -->
     <!-- No API's intended to be used, none should be called from outside. -->
     <maven.javadoc.skip>true</maven.javadoc.skip>
-    <pmdVersion>7.8.0</pmdVersion>
+    <pmdVersion>7.9.0</pmdVersion>
     <spotbugs.effort>Max</spotbugs.effort>
     <spotbugs.threshold>Low</spotbugs.threshold>
     <spotless.check.skip>false</spotless.check.skip>