build(deps): bump actions/setup-python from 3 to 4 in /.github/workflows

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v3...v4)

---
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

@@ -28,7 +28,7 @@ jobs:
                 uses: actions/checkout@v4
 
             -   name: Setup Python
-                uses: actions/setup-python@v3
+                uses: actions/setup-python@v4
                 with:
                     python-version: '3.8'