build(deps): bump crazy-max/ghaction-github-pages from 2.6.0 to 3.0.0

Bumps [crazy-max/ghaction-github-pages](https://github.com/crazy-max/ghaction-github-pages) from 2.6.0 to 3.0.0.
- [Release notes](https://github.com/crazy-max/ghaction-github-pages/releases)
- [Changelog](https://github.com/crazy-max/ghaction-github-pages/blob/dev/CHANGELOG.md)
- [Commits](crazy-max/ghaction-github-pages@v2.6.0...v3.0.0)

---
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/ci.yml

@@ -52,7 +52,7 @@ jobs:
       - name: Publish docs
         if: >
           github.event_name == 'push' && github.ref == 'refs/heads/main'
-        uses: crazy-max/ghaction-github-pages@v2.6.0
+        uses: crazy-max/ghaction-github-pages@v3.0.0
         with:
           build_dir: union/htmldocs
         env: