build(deps): bump next from 14.2.4 to 14.2.15 in /frontend

Bumps [next](https://github.com/vercel/next.js) from 14.2.4 to 14.2.15.
- [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...v14.2.15)

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

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "@coinbase/onchainkit": "^0.23.4",
     "@rainbow-me/rainbowkit": "^2.1.2",
-    "next": "^14.2.4",
+    "next": "^14.2.15",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },