Use GH concurrency setting

Author: dcherian

.github/workflows/cancel-duplicate-runs.yaml

@@ -10,6 +10,10 @@ on:
     - cron: "0 0 * * *" # Daily “At 00:00”
   workflow_dispatch: # allows you to trigger manually
 
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: Build (${{ matrix.python-version }}, ${{ matrix.os }})