chore(deps): bump next from 13.5.5 to 14.2.21 in /docs

Bumps [next](https://github.com/vercel/next.js) from 13.5.5 to 14.2.21.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v13.5.5...v14.2.21)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
...

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

docs/package.json

@@ -30,7 +30,7 @@
     "framer-motion": "^11.2.10",
     "html-react-parser": "^5.1.10",
     "jest": "^29.7.0",
-    "next": "13.5.5",
+    "next": "14.2.21",
     "postcss": "8.4.29",
     "react": "18.2.0",
     "react-dom": "18.2.0",