chore(deps): bump next in /tests/integration/__fixtures__/next-app

Bumps [next](https://github.com/vercel/next.js) from 14.2.25 to 15.2.4.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.25...v15.2.4)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.2.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

tests/integration/__fixtures__/next-app/package-lock.json

@@ -11,6 +11,6 @@
   "dependencies": {
     "react": "^18",
     "react-dom": "^18",
-    "next": "14.2.25"
+    "next": "14.2.30"
   }
 }