Update actions/setup-python action to v4

Author: renovate[bot]

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Set up Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.8