Update Helm release grafana to v9.2.1

Author: renovate[bot]

applications/grafana.yaml

@@ -14,7 +14,7 @@ spec:
       directory:
         recurse: true
     - repoURL: "https://grafana.github.io/helm-charts"
-      targetRevision: 9.2.0
+      targetRevision: 9.2.1
       chart: grafana
       helm:
         values: |