Bump com.puppycrawl.tools:checkstyle from 10.21.3 to 10.21.4

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.21.3 to 10.21.4.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.21.3...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

@@ -26,7 +26,7 @@
         <pmd-plugin.version>3.26.0</pmd-plugin.version>
         <pmd.version>7.11.0</pmd.version>
         <checkstyle-plugin.version>3.6.0</checkstyle-plugin.version>
-        <checkstyle.version>10.21.3</checkstyle.version>
+        <checkstyle.version>10.21.4</checkstyle.version>
 
         <!-- SonarCloud setup -->
         <sonar.projectKey>SvenWoltmann_sorting-algorithms-ultimate-guide</sonar.projectKey>