Update mavenPluginToolsVersion to v3.15.2

Author: renovate[bot]

pom.xml

@@ -87,7 +87,7 @@ under the License.
     <mavenVersion>2.2.1</mavenVersion>
     <maven.test.jvmargs>-Xmx1024m</maven.test.jvmargs>
     <surefire.version>3.5.4</surefire.version>
-    <mavenPluginToolsVersion>3.6.0</mavenPluginToolsVersion>
+    <mavenPluginToolsVersion>3.15.2</mavenPluginToolsVersion>
 
     <!-- repository settings -->
     <distribution.snapshotRepositoryId>sonatype-central-snapshots</distribution.snapshotRepositoryId>