Update actions/setup-python action to v4

Author: renovate-bot

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: '3.8.5'
         cache: 'pip'