build(deps): bump next in /packages/examples/next-15

Bumps [next](https://github.com/vercel/next.js) from 15.4.7 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@v15.4.7...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]

packages/examples/next-15/package.json

@@ -11,7 +11,7 @@
     "@react-pdf/renderer": "^4.3.1",
     "react": "19.0.0-rc-66855b96-20241106",
     "react-dom": "19.0.0-rc-66855b96-20241106",
-    "next": "15.4.7"
+    "next": "15.4.9"
   },
   "devDependencies": {
     "postcss": "^8",