Bump com.puppycrawl.tools:checkstyle in the maven group (#277)

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


Updates `com.puppycrawl.tools: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
  dependency-group: maven
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -47,7 +47,7 @@
     <maven.compiler.release>11</maven.compiler.release>
     <project.build.outputTimestamp>2021-08-03T00:00:00Z</project.build.outputTimestamp>
     <!-- plugin and dependency versions -->
-    <version.checkstyle>10.20.2</version.checkstyle>
+    <version.checkstyle>10.21.0</version.checkstyle>
     <version.dropwizard>4.2.29</version.dropwizard>
     <version.jackson>2.18.2</version.jackson>
     <version.jetty>9.4.56.v20240826</version.jetty>