chore(deps): update cloudnative-pg docker tag to v0.28.0

Author: renovate[bot]

clusters/_base/addons/cnpg-operator/helm-release.yaml

@@ -11,7 +11,7 @@ spec:
   chart:
     spec:
       chart: cloudnative-pg
-      version: 0.24.0
+      version: 0.28.0
       sourceRef:
         kind: HelmRepository
         name: cloudnative-pg