chore(deps): bump next from 14.2.15 to 14.2.21 in /game (#37)

Bumps [next](https://github.com/vercel/next.js) from 14.2.15 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@v14.2.15...v14.2.21)

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

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

Author: dependabot[bot]

game/package-lock.json

@@ -20,7 +20,7 @@
     "class-variance-authority": "^0.7.0",
     "clsx": "^2.1.1",
     "lucide-react": "^0.416.0",
-    "next": "14.2.15",
+    "next": "14.2.21",
     "next-themes": "^0.3.0",
     "react": "^18",
     "react-chessboard": "^4.6.0",