Update GitHub actions to fix deprecation warnings (#11)

Author: slovdahl

.github/workflows/test.yml

@@ -23,8 +23,8 @@ jobs:
           - '3.9'
           - '3.10'
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install requirements