chore(deps): update dependency org.apache.maven.plugins:maven-enforcer-plugin to v3.1.0 (#1175)

Co-authored-by: Averi Kitsch <akitsch@google.com>

Author: renovate-bot

appengine-standard-java8/helloworld-gae-javasdk-tools/pom.xml

@@ -196,7 +196,7 @@ limitations under the License.
 
       <plugin>
         <artifactId>maven-enforcer-plugin</artifactId>
-        <version>3.0.0</version>
+        <version>3.1.0</version>
         <executions>
           <execution>
             <id>enforce-maven</id>