Update maven-plugins parent to version 28.
Update maven-plugins parent to version 28.

git-svn-id: 6038db50b076e48c7926ed71fd94f8e91be2fbc9@1708864 13f79535-47bb-0310-9956-ffa450edef68

rkorpachyov/maven-plugins,krosenvold/maven-plugins,hgschmie/apache-maven-plugins,rkorpachyov/maven-plugins,mcculls/maven-plugins,sonatype/maven-plugins,hazendaz/maven-plugins,restlet/maven-plugins,zigarn/maven-plugins,HubSpot/maven-plugins,krosenvold/maven-plugins,sonatype/maven-plugins,lennartj/maven-plugins,hazendaz/maven-plugins,rkorpachyov/maven-plugins,zigarn/maven-plugins,apache/maven-plugins,mcculls/maven-plugins,mcculls/maven-plugins,rkorpachyov/maven-plugins,hazendaz/maven-plugins,hazendaz/maven-plugins,zigarn/maven-plugins,restlet/maven-plugins,restlet/maven-plugins,lennartj/maven-plugins,sonatype/maven-plugins,hgschmie/apache-maven-plugins,HubSpot/maven-plugins,HubSpot/maven-plugins,mcculls/maven-plugins,hgschmie/apache-maven-plugins,restlet/maven-plugins,HubSpot/maven-plugins,sonatype/maven-plugins,krosenvold/maven-plugins,apache/maven-plugins,lennartj/maven-plugins,krosenvold/maven-plugins,lennartj/maven-plugins,apache/maven-plugins,hazendaz/maven-plugins,hgschmie/apache-maven-plugins,apache/maven-plugins,apache/maven-plugins,rkorpachyov/maven-plugins,zigarn/maven-plugins