Update EOL GitHub Actions dependencies (#67)

Author: jwnrt

.github/workflows/python.yml

@@ -16,9 +16,9 @@ jobs:
     timeout-minutes: 5
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: 3.9
     - name: Install dependencies