chore(ui-deps): bump next from 15.3.3 to 15.5.3 in /llama_stack/ui

Bumps [next](https://github.com/vercel/next.js) from 15.3.3 to 15.5.3.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v15.3.3...v15.5.3)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

llama_stack/ui/package.json

@@ -25,7 +25,7 @@
     "framer-motion": "^12.23.12",
     "llama-stack-client": "^0.2.21",
     "lucide-react": "^0.542.0",
-    "next": "15.3.3",
+    "next": "15.5.3",
     "next-auth": "^4.24.11",
     "next-themes": "^0.4.6",
     "react": "^19.0.0",