build(deps-dev): bump gh-pages from 5.0.0 to 6.0.0 (#23)

Bumps [gh-pages](https://github.com/tschaub/gh-pages) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/tschaub/gh-pages/releases)
- [Changelog](https://github.com/tschaub/gh-pages/blob/main/changelog.md)
- [Commits](tschaub/gh-pages@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: gh-pages
  dependency-type: direct:development
  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>

package.json

@@ -19,7 +19,7 @@
     "wallpaper": "^5.0.1"
   },
   "devDependencies": {
-    "gh-pages": "^5.0.0",
+    "gh-pages": "^6.0.0",
     "npm-run-all": "^4.1.5",
     "serve": "^14.1.2",
     "sitedown": "^5.1.3",