Update python.yml

Author: wenbinf

.github/workflows/python.yml

@@ -16,9 +16,9 @@ jobs:
         python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Use Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - run: make