prevent JDK 11 job from being canceled when JDK 17 fails

Author: CalvinKirs

.github/workflows/backend.yml

@@ -24,8 +24,8 @@ on:
     branches: [ main ]
 
 concurrency:
-  group: ${{ github.repository }}-${{ github.ref }}-${{ github.workflow }}-jdk-${{ matrix.java }}
-  cancel-in-progress: true
+  group: backend-${{ github.event.pull_request.number || github.ref }}
+
 
 
 jobs: