chore(deps): bump actions/setup-python from 2 to 4.1.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2 to 4.1.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v2...v4.1.0)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/gh-pages.yaml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4.1.0
         with:
           python-version: 3.x
       - name: Set up Go