build(deps): bump next from 15.2.4 to 15.4.7 in /examples/with-next

Bumps [next](https://github.com/vercel/next.js) from 15.2.4 to 15.4.7.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.2.4...v15.4.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.4.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/with-next/package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "@duffel/api": "^2.5.2",
     "classnames": "^2.3.1",
-    "next": "^15.2.4",
+    "next": "^15.4.7",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"
   },