Bump commons.pmd-impl.version from 7.19.0 to 7.20.0 (#689)

Bumps `commons.pmd-impl.version` from 7.19.0 to 7.20.0.

Updates `net.sourceforge.pmd:pmd-core` from 7.19.0 to 7.20.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Commits](pmd/pmd@pmd_releases/7.19.0...pmd_releases/7.20.0)

Updates `net.sourceforge.pmd:pmd-java` from 7.19.0 to 7.20.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Commits](pmd/pmd@pmd_releases/7.19.0...pmd_releases/7.20.0)

Updates `net.sourceforge.pmd:pmd-javascript` from 7.19.0 to 7.20.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Commits](pmd/pmd@pmd_releases/7.19.0...pmd_releases/7.20.0)

Updates `net.sourceforge.pmd:pmd-jsp` from 7.19.0 to 7.20.0
- [Release notes](https://github.com/pmd/pmd/releases)
- [Commits](pmd/pmd@pmd_releases/7.19.0...pmd_releases/7.20.0)

---
updated-dependencies:
- dependency-name: net.sourceforge.pmd:pmd-core
  dependency-version: 7.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: net.sourceforge.pmd:pmd-java
  dependency-version: 7.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: net.sourceforge.pmd:pmd-javascript
  dependency-version: 7.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: net.sourceforge.pmd:pmd-jsp
  dependency-version: 7.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

pom.xml

@@ -133,7 +133,7 @@
     <commons.javadoc.version>3.12.0</commons.javadoc.version>
     <commons.jxr.version>3.6.0</commons.jxr.version>
     <commons.pmd.version>3.28.0</commons.pmd.version>
-    <commons.pmd-impl.version>7.19.0</commons.pmd-impl.version>
+    <commons.pmd-impl.version>7.20.0</commons.pmd-impl.version>
     <commons.project-info.version>3.9.0</commons.project-info.version>
     <commons.rat.version>0.17</commons.rat.version>
     <commons.release-plugin.version>1.9.1</commons.release-plugin.version>