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

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] <[email protected]>

package.json

@@ -182,7 +182,7 @@
     "estraverse-fb": "^1.3.2",
     "fake-indexeddb": "^4.0.1",
     "form-data": "^4.0.0",
-    "gh-pages": "^5.0.0",
+    "gh-pages": "^6.0.0",
     "http-server": "^14.0.0",
     "intern": "^4.10.0",
     "kinto-node-test-server": "^2.0.0",