chore(deps): bump grafana/grafana docker tag to v12.3.0 (#6712)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

examples/AspNetCore/docker-compose.yaml

@@ -37,7 +37,7 @@ services:
 
 # UI to query traces and metrics
   grafana:
-    image: grafana/grafana:12.2.1@sha256:35c41e0fd0295f5d0ee5db7e780cf33506abfaf47686196f825364889dee878b
+    image: grafana/grafana:12.3.0@sha256:70d9599b186ce287be0d2c5ba9a78acb2e86c1a68c9c41449454d0fc3eeb84e8
     volumes:
       - ./grafana-datasources.yaml:/etc/grafana/provisioning/datasources/datasources.yaml
     environment: