Update grafana/grafana Docker tag to v11.6.2

Author: renovate[bot]

docker-compose.yaml

@@ -36,7 +36,7 @@ services:
 
     # Grafana Container
     grafana:
-        image: grafana/grafana:11.4.0
+        image: grafana/grafana:11.6.2
         environment:
             - GF_SECURITY_ADMIN_USER=${ADMIN_USER:-admin}
             - GF_SECURITY_ADMIN_PASSWORD=${ADMIN_PASSWORD:-admin}