Update dependency org.apache.maven.plugins:maven-plugin-plugin to v3.6.4

Author: renovate-bot

pom.xml

@@ -19,7 +19,7 @@
 
         <maven.version>3.6.3</maven.version>
         <maven.annotations.version>3.6.0</maven.annotations.version>
-        <maven.plugin.plugin.version>3.6.0</maven.plugin.plugin.version>
+        <maven.plugin.plugin.version>3.6.4</maven.plugin.plugin.version>
         <!-- actually a dependency here. -->
         <dependency.maven.bundle.plugin.version>5.1.2</dependency.maven.bundle.plugin.version>
         <tycho.version>2.5.0</tycho.version>