try to avoid git error in actions..

Author: coke

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Run tests
         run: ./util/github-action-test.sh t