Upgrade GitHub Actions setup-python (#61)

https://github.com/actions/setup-python/releases

Author: cclauss

codespell-problem-matcher/.github/workflows/test.yml

@@ -25,7 +25,9 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@master
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v4
+      with:
+        python-version:3.x
     - run: pip install git+https://github.com/codespell-project/codespell.git
     - uses: ./
     - name: Check codespell