Update Helm release postgres-cluster to v6

renovate.json

@@ -36,6 +36,24 @@
             "automerge": true,
             "minimumReleaseAge": "1 days"
         },
+        {
+            "description": "Automerge chart updates for certain applications",
+            "matchUpdateTypes": [
+                "minor"
+            ],
+            "matchDatasources": [
+                "helm"
+            ],
+            "matchPackageNames": [
+                "kube-prometheus-stack"
+            ],
+            "addLabels": [
+                "chart",
+                "automerge"
+            ],
+            "automerge": true,
+            "minimumReleaseAge": "1 days"
+        },
         {
             "description": "Label images",
             "matchDatasources": [
@@ -84,8 +102,7 @@
                 "ghcr.io/linuxserver/radarr",
                 "ghcr.io/linuxserver/sonarr",
                 "ghcr.io/n8n-io/n8n",
-                "clidey/whodb",
-                "kube-prometheus-stack"
+                "clidey/whodb"
             ],
             "addLabels": [
                 "image",