chore(deps): bump next in /advanced/dapps/chat-demo-agent (#861)

Bumps [next](https://github.com/vercel/next.js) from 15.1.4 to 15.2.3.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.1.4...v15.2.3)

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

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

Author: dependabot[bot]

advanced/dapps/chat-demo-agent/package.json

@@ -27,7 +27,7 @@
     "date-fns": "^4.1.0",
     "dompurify": "^3.2.3",
     "lucide-react": "^0.427.0",
-    "next": "15.1.4",
+    "next": "15.2.3",
     "next-themes": "^0.3.0",
     "openai": "^4.78.1",
     "pino-pretty": "^11.2.2",