Bump com.puppycrawl.tools:checkstyle from 10.21.0 to 10.21.4

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.21.0 to 10.21.4.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.21.0...checkstyle-10.21.4)

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

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

Author: dependabot[bot]

pom.xml

@@ -166,7 +166,7 @@
 
     <!-- Checkstyle configuration -->
     <checkstyle.plugin.version>3.6.0</checkstyle.plugin.version>
-    <checkstyle.version>10.21.0</checkstyle.version>
+    <checkstyle.version>10.21.4</checkstyle.version>
     <checkstyle.configdir>.</checkstyle.configdir>
 
     <!-- Java version to use -->