chore(deps): bump next in /packages/themes/examples/preview (#19507)

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

Author: dependabot[bot]

packages/themes/examples/preview/package.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "@carbon/colors": "link:../../../colors",
     "@carbon/themes": "link:../../",
-    "next": "^14.2.25",
+    "next": "^15.2.4",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "sass": "^1.36.0"