[bot] [main] Automated version update (#1886)

Co-authored-by: Prometheus Operator Bot <prom-op-bot@users.noreply.github.com>

manifests/grafana-serviceAccount.yaml

@@ -6,6 +6,6 @@ metadata:
     app.kubernetes.io/component: grafana
     app.kubernetes.io/name: grafana
     app.kubernetes.io/part-of: kube-prometheus
-    app.kubernetes.io/version: 9.1.5
+    app.kubernetes.io/version: 9.1.6
   name: grafana
   namespace: monitoring