build(deps): bump next in /examples/_deprecated/next-connect-kit

Bumps [next](https://github.com/vercel/next.js) from 14.2.3 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@v14.2.3...v15.2.4)

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

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

Author: dependabot[bot]

examples/_deprecated/next-connect-kit/package.json

@@ -5,7 +5,7 @@
     "@imtbl/sdk": "latest",
     "@tanstack/react-query": "^5.37.1",
     "connectkit": "^1.7.3",
-    "next": "14.2.3",
+    "next": "15.2.4",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "viem": "2.x",