Bump crazy-max/ghaction-github-pages from 2 to 4 (#48)

Bumps [crazy-max/ghaction-github-pages](https://github.com/crazy-max/ghaction-github-pages) from 2 to 4.
- [Release notes](https://github.com/crazy-max/ghaction-github-pages/releases)
- [Commits](crazy-max/ghaction-github-pages@v2...v4)

---
updated-dependencies:
- dependency-name: crazy-max/ghaction-github-pages
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
 
       - name: Deploy to GitHub Pages
         if: success() && github.event_name == 'push' && github.event.ref == 'refs/heads/main'
-        uses: crazy-max/ghaction-github-pages@v2
+        uses: crazy-max/ghaction-github-pages@v4
         with:
           target_branch: gh-pages
           build_dir: docs