kiji-express-music: Use new version of root-pom

commit: https://github.com/kijiproject/kiji-express-music/commit/dca33dc2f60abad75251badf0b3e6f39ff126401
bento-cluster: Use new version of root-pom

commit: https://github.com/kijiproject/bento-cluster/commit/482b35fe15726e8d04f333bbd648875eb70d2ec4