feat(helm)!: Update chart grafana to 8.3.6

Author: renovate[bot]

kubernetes/apps/observability/grafana/app/helmrelease.yaml

@@ -8,7 +8,7 @@ spec:
   chart:
     spec:
       chart: grafana
-      version: 7.3.10
+      version: 8.3.6
       sourceRef:
         kind: HelmRepository
         name: grafana