Bump com.puppycrawl.tools:checkstyle in the test-dependencies group

Bumps the test-dependencies group with 1 update: [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle).


Updates `com.puppycrawl.tools:checkstyle` from 10.19.0 to 10.20.0
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.19.0...checkstyle-10.20.0)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -42,7 +42,7 @@
     <java.minimum.version>1.9</java.minimum.version>
 
     <!-- Plugin versions -->
-    <checkstyle.version>10.19.0</checkstyle.version>
+    <checkstyle.version>10.20.0</checkstyle.version>
     <checkstyle-plugin.version>3.6.0</checkstyle-plugin.version>
     <compiler-plugin.version>3.13.0</compiler-plugin.version>
     <gpg-plugin.version>3.2.7</gpg-plugin.version>