Update spotless.yml

Author: SentryMan

.github/workflows/spotless.yml

@@ -2,6 +2,7 @@ name: Spotless Check
 on: [push, workflow_dispatch]
 
 concurrency:
+    group: "${{ github.workflow }}-${{ github.event.number || github.ref }}"
     cancel-in-progress: true
 jobs:
   check: