Bump next from 15.5.2 to 15.5.7 in /apps/nextjs-app

Bumps [next](https://github.com/vercel/next.js) from 15.5.2 to 15.5.7.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.2...v15.5.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.7
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

apps/nextjs-app/package.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "example-ui": "0.0.54",
-    "next": "15.5.2",
+    "next": "15.5.7",
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "react-strict-dom": "0.0.54"