👷 misc(CI): add concurrency control to sumi action

Author: welpo

.github/workflows/git-sumi.yml

@@ -8,6 +8,10 @@ on:
       - synchronize
       - ready_for_review
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   pull-requests: read