Merge pull request #6 from hankei6km:topic/setup-github

chore: Use actions/checkout@v2 temporary

Author: hankei6km

.github/workflows/cleanup.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v2
 
       - name: Cleanup
         run: |