Add cancel-in-progress

Author: RealCLanger

.github/workflows/sync-fork-checks.yml

@@ -37,6 +37,10 @@ on:
       - synchronize
       - reopened
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
   checks: write
   pull-requests: read