Update K8s images in base to v6.9.391

Author: DaedalusG

base/monitoring/grafana/grafana.StatefulSet.yaml

@@ -26,7 +26,7 @@ spec:
     spec:
       containers:
         - name: grafana
-          image: index.docker.io/sourcegraph/grafana:6.2.1106@sha256:d0abf7879ffd0153394a1d5e2951ac23bc4138cabc0f0fd6ed2fd9eded7be215
+          image: us-docker.pkg.dev/sourcegraph-images/internal/grafana:6.9.391@sha256:420c512256273a460db89762f85b2ad65a4a76706516feb4e2183466c4edc078
           terminationMessagePolicy: FallbackToLogsOnError
           ports:
             - containerPort: 3370