Bump next from 15.0.4 to 15.1.2 in /website (#149)

Bumps [next](https://github.com/vercel/next.js) from 15.0.4 to 15.1.2.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.0.4...v15.1.2)

---
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>

website/package.json

@@ -18,7 +18,7 @@
     "focus-visible": "^5.2.1",
     "geist": "^1.3.1",
     "marked": "^15.0.3",
-    "next": "15.0.4",
+    "next": "15.1.2",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "tailwind-merge": "^2.5.5",