Remove references to com.day.jcr.vault:content-package-maven-plugin

[joerghoh]

Expected Behaviour

the dependency to the content-package-maven-plugin should be removed. It's functionality has been replaced by the filevault-package-maven-plugin

Actual Behaviour

the reference is present, but unused.

[kwin]

As outlined in https://jackrabbit.apache.org/filevault-package-maven-plugin/migrating.html this plugin is still used for the actual deployment.