refactor: upgrade grafana to v11.6.0 (#8391)

Co-authored-by: Klesh Wong <zhenmian.huang@merico.dev>

Author: nlespiaucq

grafana/Dockerfile

@@ -23,7 +23,7 @@
 #While incubation status is not necessarily a reflection of the completeness or stability of the code,
 #it does indicate that the project has yet to be fully endorsed by the ASF.
 
-FROM grafana/grafana:11.2.0
+FROM grafana/grafana:11.6.0
 COPY ./provisioning/dashboards /etc/grafana/provisioning/dashboards
 COPY ./provisioning/datasources /etc/grafana/provisioning/datasources
 COPY ./dashboards /etc/grafana/dashboards