[MANTRUN-236] Upgrade Maven Plugin Plugin to 3.6.4

Author: michael-o

pom.xml

@@ -65,7 +65,7 @@ under the License.
  <mavenVersion>3.2.5</mavenVersion>
  <javaVersion>8</javaVersion>
  <surefire.version>2.22.2</surefire.version>
- <mavenPluginToolsVersion>3.6.2</mavenPluginToolsVersion>
+ <mavenPluginToolsVersion>3.6.4</mavenPluginToolsVersion>
  <project.build.outputTimestamp>2020-04-12T07:51:40Z</project.build.outputTimestamp>
  </properties>