enable watching configmaps for prometheus server (#10973)

Signed-off-by: Rico Pahlisch <rico.pahlisch@kiwigrid.com>

stable/prometheus/Chart.yaml

@@ -1,5 +1,5 @@
 name: prometheus
-version: 8.4.9
+version: 8.5.0
 appVersion: 2.6.1
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/

stable/prometheus/templates/server-clusterrole.yaml

@@ -15,16 +15,11 @@ rules:
       - endpoints
       - pods
       - ingresses
+      - configmaps
     verbs:
       - get
       - list
       - watch
-  - apiGroups:
-      - ""
-    resources:
-      - configmaps
-    verbs:
-      - get
   - apiGroups:
       - "extensions"
     resources: