dependencyManagement does not work for transitive dependencies
remove copy of plexus-utils sources from site plugin sources since it is a dependency
Extensions that have no declared dependency on plexus-utils yet need it at runtime will fail.
[regression] Plugins that don't declare dependency on plexus-utils no longer get plexus-utils:1.1
Plugins with indirect dependency on plexus-utils are stuck with plexus-utils:1.1
Shade MX* classes from plexus-utils