Bump gh-pages from 2.2.0 to 3.2.3 in /packages/playground

Bumps [gh-pages](https://github.com/tschaub/gh-pages) from 2.2.0 to 3.2.3.
- [Release notes](https://github.com/tschaub/gh-pages/releases)
- [Changelog](https://github.com/tschaub/gh-pages/blob/main/changelog.md)
- [Commits](https://github.com/tschaub/gh-pages/compare/v2.2.0...v3.2.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

packages/playground/package.json

@@ -19,7 +19,7 @@
     "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
     "binary-search-tree": "0.2.6",
     "css-loader": "^6.7.1",
-    "gh-pages": "2.2.0",
+    "gh-pages": "3.2.3",
     "jstat": "1.9.2",
     "lenses-ppx": "5.1.0",
     "less": "3.10.3",