ci: use unique concurrency.group for native_backend_tests.yml

Author: spytheman

.github/workflows/native_backend_tests.yml

@@ -9,7 +9,7 @@ on:
       - "**.md"
 
 concurrency:
-  group: build-ci-${{ github.event.pull_request.number || github.sha }}
+  group: native-backend-ci-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs: