Merge pull request #5 from pythonanywhere/renovate/actions-setup-python-4.x

chore(deps): update actions/setup-python action to v4

Author: filiplajszczak

.github/workflows/tests.yaml

@@ -20,7 +20,7 @@ jobs:
         timezone: UTC
 
     - name: Set up Python
-      uses: actions/setup-python@e9aba2c848f5ebd159c070c61ea2c4e2b122355e # v2
+      uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1 # v4
       with:
         python-version: ${{ matrix.python-version }}