Bump next from 15.3.3 to 15.4.7 in /packages/frontend

Bumps [next](https://github.com/vercel/next.js) from 15.3.3 to 15.4.7.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.3.3...v15.4.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.4.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/frontend/package.json

@@ -37,7 +37,7 @@
     "framer-motion": "^12.18.1",
     "highlight.js": "^11.11.1",
     "lucide-react": "^0.515.0",
-    "next": "15.3.3",
+    "next": "15.4.7",
     "pdfjs-dist": "^5.3.31",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",