chore(deps): bump next from 15.4.8 to 15.4.9 in /examples/nextjs-app

Bumps [next](https://github.com/vercel/next.js) from 15.4.8 to 15.4.9.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.4.8...v15.4.9)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.4.9
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/nextjs-app/package.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "@auth0/auth0-react": "file:../..",
-    "next": "15.4.8",
+    "next": "15.4.9",
     "react": "file:../../node_modules/react",
     "react-dom": "file:../../node_modules/react-dom"
   }