Bump edu.hm.hafner:codingstyle from 3.19.0 to 3.21.0

Bumps [edu.hm.hafner:codingstyle](https://github.com/uhafner/codingstyle) from 3.19.0 to 3.21.0.
- [Release notes](https://github.com/uhafner/codingstyle/releases)
- [Changelog](https://github.com/uhafner/codingstyle/blob/main/CHANGELOG.md)
- [Commits](uhafner/codingstyle@v3.19.0...v3.21.0)

---
updated-dependencies:
- dependency-name: edu.hm.hafner:codingstyle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -26,7 +26,7 @@
     <jenkins.baseline>2.387</jenkins.baseline>
     <jenkins.version>${jenkins.baseline}.3</jenkins.version>
     <spotbugs.failOnError>false</spotbugs.failOnError>
-    <codingstyle.config.version>3.19.0</codingstyle.config.version>
+    <codingstyle.config.version>3.21.0</codingstyle.config.version>
 
     <!-- NPM and node versions for frontend-maven-plugin -->
     <node.version>18.17.1</node.version>