added concurrency check so old workflow gets cancelled

Author: michalChrobot

.github/workflows/pr-supervisor.yaml

@@ -14,6 +14,10 @@ on:
       - develop
       - develop-2.0.0
       - release/*
+        
+concurrency:
+  group: pr-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
 
 jobs:
   yamato-supervisor: