Bump crazy-max/ghaction-github-pages from 2 to 4

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] <[email protected]>

.github/workflows/build.yml

@@ -333,7 +333,7 @@ jobs:
         if: success() && (
             startsWith(github.ref, 'refs/tags/v') ||
             github.ref == 'refs/heads/master')
-        uses: crazy-max/ghaction-github-pages@v2
+        uses: crazy-max/ghaction-github-pages@v4
         with:
           build_dir: doc/_build/html
           commit_message: Build documentation from ${{ github.ref }}@${{ github.sha }}