Upgrade actions/checkout and setup-python (pypa#162)

Author: cclauss

.github/workflows/test.yml

@@ -14,9 +14,9 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python }}
     - name: Install test dependencies