feat(helm): update chart kube-prometheus-stack to 56.9.0 (#5525)

| datasource | package               | from   | to     |
| ---------- | --------------------- | ------ | ------ |
| helm       | kube-prometheus-stack | 56.6.2 | 56.9.0 |

Co-authored-by: rosey-the-renovator-bot[bot] <98764075+rosey-the-renovator-bot[bot]@users.noreply.github.com>

kubernetes/main/apps/monitoring/kube-prometheus-stack/app/helmrelease.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: kube-prometheus-stack
-      version: 56.6.2
+      version: 56.9.0
       sourceRef:
         kind: HelmRepository
         name: prometheus-community-charts