chore(deps): bump next from 15.4.10 to 16.1.5 in /test-apps/nextjs (#838)

Bumps [next](https://github.com/vercel/next.js) from 15.4.10 to 16.1.5.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.4.10...v16.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.1.5
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

test-apps/nextjs/package.json

@@ -9,7 +9,7 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "next": "15.4.10",
+    "next": "16.1.5",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   },