Fix coordinates of Groovy plugin in packaging pipeline
<plugin> <!-- we attach a dummy main artifact for the packaging project,
because Appbundle requires one -->
<groupId>org.codehaus.gmaven</groupId>
- <artifactId>gmaven-plugin</artifactId>
- <version>1.3</version>
+ <artifactId>groovy-maven-plugin</artifactId>
+ <version>2.1.1</version>
<executions>
<execution>
<id>set-main-artifact</id>
