chore: update helm charts

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

Author: renovate[bot]

examples/omni/apps/monitoring/kube-prometheus-stack/Chart.yaml

@@ -3,5 +3,5 @@ name: kube-prometheus-stack
 version: 56.0.0
 dependencies:
   - name: kube-prometheus-stack
-    version: 56.0.0
+    version: 56.21.4
     repository: https://prometheus-community.github.io/helm-charts

examples/omni/apps/rook-ceph/cluster/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: &name rook-ceph-cluster
-version: &version v1.18.5
+version: &version v1.18.6
 dependencies:
   - name: *name
     version: *version 

examples/omni/apps/rook-ceph/operator/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: &name rook-ceph
-version: &version v1.18.5
+version: &version v1.18.6
 dependencies:
   - name: *name 
     version: *version