Improvements

Rook v1.16.4 is a patch release limited in scope and focusing on feature additions and bug fixes to the Ceph operator.

• manifest: Update default Ceph version to v19.2.1 (#15392, @subhamkrai)
• osd: Avoid lvm device scan deadlock in activate (#15377, @sfackler)
• nfs: Workaround nfs-ganesha config parser for single quotes (#15393, @BlaineEXE)
• osd: Enable osd ok-to-stop checks on single node where there are at least three OSDs (#15370, @travisn)
• helm: Support for custom pod labels in operator deployment config (#15372, @hans-fischer)
• helm: Fix hardcoded namespace in cephECBlockPool StorageClass (#15402, @KarolGongola)
• helm: add support for ingress path type (#15385, @HoKim98)
• helm: Fix deploy notes documentation link to CRDs (#15404, @jcookin)