build(deps): bump next in /e2e-tests/test-applications/nextjs-test-app

Bumps [next](https://github.com/vercel/next.js) from 14.2.14 to 14.2.15.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.14...v14.2.15)

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

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

e2e-tests/test-applications/nextjs-test-app/package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "react": "^18",
     "react-dom": "^18",
-    "next": "14.2.14"
+    "next": "14.2.15"
   },
   "devDependencies": {
     "typescript": "^5",