Bump next from 15.1.0 to 15.2.4 in /starters/nextjs/firebase-ecommerce

Bumps [next](https://github.com/vercel/next.js) from 15.1.0 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@v15.1.0...v15.2.4)

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

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

Author: dependabot[bot]

starters/nextjs/firebase-ecommerce/package.json

@@ -19,7 +19,7 @@
     "cookies-next": "^5.0.2",
     "embla-carousel-react": "^8.3.1",
     "firebase": "^11.1.0",
-    "next": "15.1.0",
+    "next": "15.2.4",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-markdown": "^9.0.1",