chore(deps): update helm release grafana to v9.2.8

Author: renovate[bot]

common/core/monitoring/grafana/app/templates/release.yaml

@@ -24,7 +24,7 @@ spec:
   chart:
     spec:
       chart: grafana
-      version: 9.2.7
+      version: 9.2.8
       reconcileStrategy: ChartVersion
       sourceRef:
         kind: HelmRepository