Bump gh-pages from 3.2.3 to 4.0.0

Bumps [gh-pages](https://github.com/tschaub/gh-pages) from 3.2.3 to 4.0.0.
- [Release notes](https://github.com/tschaub/gh-pages/releases)
- [Changelog](https://github.com/tschaub/gh-pages/blob/main/changelog.md)
- [Commits](tschaub/gh-pages@v3.2.3...v4.0.0)

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

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

Author: dependabot[bot]

package.json

@@ -54,7 +54,7 @@
     "eslint": "^7.1.0",
     "father": "^2.23.1",
     "father-build": "^1.18.6",
-    "gh-pages": "^3.1.0",
+    "gh-pages": "^4.0.0",
     "less": "^3.11.1",
     "np": "^7.1.0",
     "react": "^16.10.2",