Bump org.apache.maven.plugins:maven-checkstyle-plugin

Bumps [org.apache.maven.plugins:maven-checkstyle-plugin](https://github.com/apache/maven-checkstyle-plugin) from 3.3.0 to 3.3.1.
- [Commits](apache/maven-checkstyle-plugin@maven-checkstyle-plugin-3.3.0...maven-checkstyle-plugin-3.3.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-checkstyle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -380,7 +380,7 @@ limitations under the License.
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-checkstyle-plugin</artifactId>
-          <version>3.3.0</version>
+          <version>3.3.1</version>
           <configuration>
             <configLocation>config/maven_checks.xml</configLocation>
             <!-- version from release 11 referenced by branch -->