fix(helm): update chart rook-ceph-cluster to v1.18.4 (#1730)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

kubernetes/apps/rook-ceph/rook-ceph/cluster/helmrelease.yaml

@@ -8,7 +8,7 @@ spec:
   chart:
     spec:
       chart: rook-ceph-cluster
-      version: v1.18.3
+      version: v1.18.4
       sourceRef:
         kind: HelmRepository
         name: rook