Improvements

Rook v1.3.9 is a patch release limited in scope and focusing on small feature additions and bug fixes.

Ceph

• Avoid removing a healthy mon unexpectedly when the operator restarts (#5868, @travisn)
• External cluster export script enhancements (#5952 #5931 #5833 #5899, @leseb @aruniiird)
• Toleration for CSI version check job (#5881, @Madhu-1)
• Remove obsolete CSI metadatastore and mountcache flags (#5870, @Madhu-1)
• Report cluster status error on heatlh check timeout (#5856, @leseb)
• Pool CR settings must be strings (#5849, @travisn)