SLING-7070 - Build failure with Java 9 in maven-enforcer-plugin
SLING-7070 - Build failure with Java 9 in maven-enforcer-plugin

Use a more recent version of the maven-enforcer-plugin.

git-svn-id: 6eed74fe9a15c8da84b9a8d7f2960c0406113ece@1805732 13f79535-47bb-0310-9956-ffa450edef68

tmaret/sling,trekawek/sling,trekawek/sling,tmaret/sling,trekawek/sling,vladbailescu/sling,trekawek/sling,tmaret/sling,tmaret/sling,ist-dresden/sling,ist-dresden/sling,ist-dresden/sling,ist-dresden/sling,tmaret/sling,trekawek/sling,vladbailescu/sling,vladbailescu/sling,vladbailescu/sling,ist-dresden/sling,vladbailescu/sling,trekawek/sling