ci: prevent multiple cr runs

.github/workflows/cr.yml

@@ -16,6 +16,10 @@ on:
 
 permissions: {}
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number }}
+  cancel-in-progress: true
+
 jobs:
   release:
     if: ${{ !github.event.pull_request.draft && contains(github.event.pull_request.labels.*.name, 'cr-tracked') && !contains(github.event.pull_request.labels.*.name, 'spam') && !contains(github.event.pull_request.labels.*.name, 'invalid') }}