Bump maven-checkstyle-plugin from 2.15 to 3.1.1

Bumps [maven-checkstyle-plugin](https://github.com/apache/maven-checkstyle-plugin) from 2.15 to 3.1.1.
- [Release notes](https://github.com/apache/maven-checkstyle-plugin/releases)
- [Commits](apache/maven-checkstyle-plugin@maven-checkstyle-plugin-2.15...maven-checkstyle-plugin-3.1.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -651,7 +651,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-checkstyle-plugin</artifactId>
-            <version>2.15</version>
+            <version>3.1.1</version>
             <configuration>
               <configLocation>config/maven_checks.xml</configLocation>
               <headerLocation>config/maven-header.txt</headerLocation>