chore(deps): bump next in /examples/with-vector-search

Bumps [next](https://github.com/vercel/next.js) from 15.2.3 to 15.4.8.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.2.3...v15.4.8)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.4.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/with-vector-search/package.json

@@ -18,7 +18,7 @@
     "@vercel/analytics": "1.5.0",
     "ai": "4.0.18",
     "clsx": "2.1.1",
-    "next": "15.2.3",
+    "next": "15.4.8",
     "ollama-ai-provider": "0.16.0",
     "prism-react-renderer": "2.4.0",
     "react": "18.3.1",