Bump com.puppycrawl.tools:checkstyle from 10.20.2 to 10.21.0

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.20.2 to 10.21.0.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.20.2...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] <[email protected]>

pom.xml

@@ -37,7 +37,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <jacoco-version>0.8.12</jacoco-version>
     <maven-checkstyle-plugin-version>3.6.0</maven-checkstyle-plugin-version>
-    <checkstyle-version>10.20.2</checkstyle-version>
+    <checkstyle-version>10.21.0</checkstyle-version>
     <junit-version>4.13.2</junit-version>
     <eclipse-site>http://download.eclipse.org/releases/${platform-version-name}</eclipse-site>
     <platform-version-name>2022-09</platform-version-name>