Bump com.puppycrawl.tools:checkstyle from 10.20.2 to 10.21.1 (#232)

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.20.2 to 10.21.1.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.20.2...checkstyle-10.21.1)

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

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

Author: dependabot[bot]

pom.xml

@@ -46,7 +46,7 @@
 
         <!--dependency versions -->
         <celesta.version>8.1.0</celesta.version>
-        <checkstyle.version>10.20.2</checkstyle.version>
+        <checkstyle.version>10.21.1</checkstyle.version>
         <spring.boot.version>2.7.18</spring.boot.version>
 
         <!--plugin versions -->