Merge pull request #97 from kevin1024/upgrade-actions

Author: graingert

.github/workflows/main.yaml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set Up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5