chore(deps): bump next from 15.5.4 to 15.5.7 in /website

Bumps [next](https://github.com/vercel/next.js) from 15.5.4 to 15.5.7.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.4...v15.5.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

website/package.json

@@ -18,7 +18,7 @@
     "fumadocs-mdx": "12.0.3",
     "fumadocs-ui": "15.2.12",
     "lucide-react": "^0.545.0",
-    "next": "15.5.4",
+    "next": "15.5.7",
     "next-themes": "^0.4.6",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",