chore(deps): bump next from 16.3.0 to 16.3.6 in /frontend (#36)

Bumps [next](https://github.com/vercel/next.js) from 16.3.0 to 16.3.6.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Commits](https://github.com/vercel/next.js/compare/v16.3.0...v16.3.6)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.3.6
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/package.json

@@ -61,7 +61,7 @@
     "jspdf": "^4.2.1",
     "lucide-react": "^1.28.0",
     "motion": "^12.43.0",
-    "next": "16.3.0",
+    "next": "16.3.6",
     "next-intl": "^4.13.6",
     "next-themes": "^0.4.6",
     "pinyin-match": "^1.2.10",