fix(semantic-pull-request): enhance workflow concurrency rule

Signed-off-by: Emilien Escalle <emilien.escalle@escemi.com>

Author: neilime

.github/workflows/semantic-pull-request.yml

@@ -34,7 +34,7 @@ permissions:
   pull-requests: write
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
   cancel-in-progress: true
 
 jobs: