Bump checkstyle from 9.0.1 to 9.1

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 9.0.1 to 9.1.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-9.0.1...checkstyle-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>

pom.xml

@@ -83,7 +83,7 @@
     <maven-pmd-plugin.version>3.15.0</maven-pmd-plugin.version>
     <pmd.version>6.39.0</pmd.version>
     <maven-checkstyle-plugin.version>3.1.2</maven-checkstyle-plugin.version>
-    <checkstyle.version>9.0.1</checkstyle.version>
+    <checkstyle.version>9.1</checkstyle.version>
     <spotbugs-maven-plugin.version>4.4.2.2</spotbugs-maven-plugin.version>
     <findsecbugs-plugin.version>1.11.0</findsecbugs-plugin.version>
     <jacoco-maven-plugin.version>0.8.7</jacoco-maven-plugin.version>