⬆ Bump actions/setup-python from 2 to 4 (#411)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

.github/workflows/build-docs.yml

@@ -21,7 +21,7 @@ jobs:
         run: echo "$GITHUB_CONTEXT"
       - uses: actions/checkout@v3.1.0
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: "3.7"
       # Allow debugging with tmate