chore(deps): bump next from 14.2.18 to 14.2.21

Bumps [next](https://github.com/vercel/next.js) from 14.2.18 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@v14.2.18...v14.2.21)

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

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

Author: dependabot[bot]

package.json

@@ -32,7 +32,7 @@
     "llamaindex": "file:app/lib/llamaindex-0.8.21.tgz",
     "lucide-react": "^0.294.0",
     "marked": "^14.1.2",
-    "next": "^14.2.4",
+    "next": "^14.2.21",
     "papaparse": "^5.4.1",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",