Update main.yml

Signed-off-by: sakshiarora13 <sakshi_arora1@dell.com>

control_plane/roles/webui_grafana/vars/main.yml

@@ -44,3 +44,4 @@ plugins_name:
   - stream-net.zip
 grafana_plugins_folder_name: github-grafana-plugins/
 grafana_plugins_github_repo: https://github.com/nsfcac/grafana-plugin.git
+grafana_plugins_stable_commit: "947da4f"