chore(deps): bump next from 14.2.10 to 15.5.4

Bumps [next](https://github.com/vercel/next.js) from 14.2.10 to 15.5.4.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.10...v15.5.4)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -27,7 +27,7 @@
     "clsx": "^2.1.1",
     "katex": "^0.16.21",
     "lucide-react": "^0.379.0",
-    "next": "14.2.10",
+    "next": "15.5.4",
     "next-themes": "^0.4.4",
     "posthog-js": "^1.207.1",
     "react": "^18",