chore(deps): update grafana/grafana docker tag to v11.6.9

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| docker     | grafana/grafana | 11.0.0 | 11.6.9 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

docker-compose.yaml

@@ -34,7 +34,7 @@ services:
       - main
 
   grafana-dep:
-    image: grafana/grafana:11.0.0
+    image: grafana/grafana:11.6.9@sha256:8dbbae5093f40e622c66f7f96862f76bdb3764fcffc727ad9952ad5d1ed79f79
     ports:
       - 3000:3000/tcp
     environment: