feat(helm)!: Update chart grafana to 8.0.0

| datasource | package | from   | to    |
| ---------- | ------- | ------ | ----- |
| helm       | grafana | 7.3.11 | 8.0.0 |

Author: rosey-the-renovator-bot[bot]

kubernetes/main/apps/monitoring/grafana/app/helmrelease.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: grafana
-      version: 7.3.11
+      version: 8.0.0
       sourceRef:
         kind: HelmRepository
         name: grafana-charts