chore(deps): bump next in /examples/with-nextjs-pages-router

Bumps [next](https://github.com/vercel/next.js) from 15.1.3 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@v15.1.3...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-nextjs-pages-router/package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@tidbcloud/uikit": "workspace:*",
-    "next": "15.1.3",
+    "next": "15.4.8",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },