Bump checkstyle from 10.8.1 to 10.9.1

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 10.8.1 to 10.9.1.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.8.1...checkstyle-10.9.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -125,7 +125,7 @@
     <nexus-staging-maven-plugin.version>1.6.13</nexus-staging-maven-plugin.version>
 
     <!-- Plugin dependencies -->
-    <checkstyle.version>10.8.1</checkstyle.version>
+    <checkstyle.version>10.9.1</checkstyle.version>
     <maven-surefire-junit5-tree-reporter.version>1.1.0</maven-surefire-junit5-tree-reporter.version>
 
     <!-- Log verbosity -->