chore(deps): update dependency org.apache.maven.plugins:maven-checkstyle-plugin to v3.2.1

Author: renovate-bot

pom.xml

@@ -288,7 +288,7 @@ limitations under the License.
           <plugin> <!-- Checkstyle -->
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-checkstyle-plugin</artifactId>
-            <version>3.1.2</version>
+            <version>3.2.1</version>
             <configuration>
               <configLocation>google-checks.xml</configLocation>
               <suppressionsLocation>suppressions.xml</suppressionsLocation>