Improvements

Rook v1.13.7 is a patch release limited in scope and focusing on feature additions and bug fixes to the Ceph operator.

• core: Set default ceph version to v18.2.2 (#13913, @travisn)
• monitoring: Increase default metrics scraping interval from 5s to 10s (#13923, @rkachach)
• exporter: Apply labels from monitoring section of CephCluster to ceph-exporter (#13902, @rkachach)