chore(deps): Bump com.puppycrawl.tools:checkstyle

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

@@ -95,7 +95,7 @@
         <junit.version>5.11.3</junit.version>
         <pi-test.version>1.17.2</pi-test.version>
         <pitest-junit5-plugin.version>1.2.1</pitest-junit5-plugin.version>
-        <checkstyle.version>10.20.2</checkstyle.version>
+        <checkstyle.version>10.21.0</checkstyle.version>
         <checkstyle.excludes></checkstyle.excludes>
         <jacoco.maven.version>0.8.12</jacoco.maven.version>
         <shrinkwrap.version>1.2.6</shrinkwrap.version>