chore(deps): bump next from 14.2.4 to 14.2.21

Bumps [next](https://github.com/vercel/next.js) from 14.2.4 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@v14.2.4...v14.2.21)

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

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

Author: dependabot[bot]

package-lock.json

@@ -24,7 +24,7 @@
     "dotenv": "^16.3.1",
     "llamaindex": "^0.4.6",
     "lucide-react": "^0.294.0",
-    "next": "^14.0.3",
+    "next": "^14.2.21",
     "pdf2json": "3.0.5",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",