Update Helm release rook-ceph to v1.18.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rook-ceph	fleet	patch	v1.18.6 -> v1.18.8

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Release Notes

rook/rook (rook-ceph)

v1.18.8

Compare Source

v1.18.7

Compare Source

Improvements

Rook v1.18.7 is a patch release limited in scope and focusing on feature additions and bug fixes to the Ceph operator.

• pool: Retry pool status updates in the radosnamespace controller (#​16700, @​parth-gr)
• osd: Add device class label to the osd prepare pods (#​16675, @​parth-gr)
• external: Fix quote parsing and message in import-external-cluster.sh (#​16646, @​GanghyeonSeo)
• object: Fix user quotas being overwritten when obc bucketOwner is set (#​16672, @​jhoblitt)
• docs: Example of application migration between clusters (#​16659, @​travisn)
• mgr: Add hostNetwork field to Ceph Mgr spec (#​16617, @​Sunnatillo)
• osd: Add CephCluster OSDMaxUpdatesInParallel to tune OSD updates (#​16655, @​jhoblitt)

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