chore(deps): bump next

Bumps [next](https://github.com/vercel/next.js) from 14.2.5 to 15.5.14.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.5...v15.5.14)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.14
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/management-sdk/examples/customer-admin-panel/package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@reflag/management-sdk": "workspace:*",
-    "next": "14.2.5",
+    "next": "15.5.14",
     "react": "18.3.1",
     "react-dom": "18.3.1"
   }