Bump org.apache.maven.plugins:maven-checkstyle-plugin (#255)

Author: dependabot[bot]

pom.xml

@@ -233,7 +233,7 @@
                 </plugin>
                 <plugin>
                     <artifactId>maven-checkstyle-plugin</artifactId>
-                    <version>3.3.1</version>
+                    <version>3.4.0</version>
                     <dependencies>
                         <dependency>
                             <groupId>com.puppycrawl.tools</groupId>