Bump com.puppycrawl.tools:checkstyle from 10.20.1 to 10.21.0

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.20.1 to 10.21.0.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.20.1...checkstyle-10.21.0)

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

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

pom.xml

@@ -63,7 +63,7 @@
 
     <!-- Dependency Versions -->
     <lib.assertj.version>3.26.3</lib.assertj.version>
-    <lib.checkstyle.version>10.20.1</lib.checkstyle.version>
+    <lib.checkstyle.version>10.21.0</lib.checkstyle.version>
     <lib.cloud-sql-postgres-socket-factory.version>1.21.0</lib.cloud-sql-postgres-socket-factory.version>
     <lib.cpe-parser.version>2.1.0</lib.cpe-parser.version>
     <lib.commons-collections4.version>4.4</lib.commons-collections4.version>