chore(deps): update helm release grafana to v8.12.0

Author: renovate[bot]

applications/grafana.yaml

@@ -9,7 +9,7 @@ spec:
     server: "https://kubernetes.default.svc"
   source:
     repoURL: "https://grafana.github.io/helm-charts"
-    targetRevision: 8.11.1
+    targetRevision: 8.12.0
     chart: grafana
     helm:
       values: |