ci: scope cla workflow concurrency group by event (#24)

Author: TheGreatAxios

.github/workflows/cla.yml

@@ -13,7 +13,7 @@ permissions:
   statuses: write
 
 concurrency:
-  group: cla-${{ github.event.pull_request.number || github.event.issue.number || github.run_id }}
+  group: cla-${{ github.event_name }}-${{ github.event.pull_request.number || github.event.issue.number || github.run_id }}
   cancel-in-progress: true
 
 jobs: