build(deps): bump next from 14.2.12 to 14.2.20 in /docs

Bumps [next](https://github.com/vercel/next.js) from 14.2.12 to 14.2.20.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v14.2.12...v14.2.20)

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

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

docs/package.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "@vercel/analytics": "^1.1.1",
     "docsgpt-react": "^0.4.8",
-    "next": "^14.2.12",
+    "next": "^14.2.20",
     "nextra": "^2.13.2",
     "nextra-theme-docs": "^2.13.2",
     "react": "^18.2.0",