build(deps-dev): bump gh-pages from 2.2.0 to 6.1.1

Bumps [gh-pages](https://github.com/tschaub/gh-pages) from 2.2.0 to 6.1.1.
- [Release notes](https://github.com/tschaub/gh-pages/releases)
- [Changelog](https://github.com/tschaub/gh-pages/blob/main/changelog.md)
- [Commits](tschaub/gh-pages@v2.2.0...v6.1.1)

---
updated-dependencies:
- dependency-name: gh-pages
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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