chore(deps): update kubernetes-csi/external-snapshotter to v8.6.0

apps/templates/cloudnativepg-helm.yaml

@@ -10,7 +10,7 @@ spec:
   source:
     chart: cloudnative-pg
     repoURL: https://cloudnative-pg.github.io/charts
-    targetRevision: 0.29.0
+    targetRevision: 0.23.2
     helm:
       values: |
         # Default values are fine

apps/templates/snapshot-controller-helm.yaml

@@ -7,7 +7,7 @@ spec:
   project: default
   source:
     repoURL: https://github.com/kubernetes-csi/external-snapshotter.git
-    targetRevision: v8.2.1
+    targetRevision: v8.6.0
     path: deploy/kubernetes/snapshot-controller
   destination:
     server: https://kubernetes.default.svc