chore(deps): bump next from 15.0.4 to 15.1.2 (#1116)

Bumps [next](https://github.com/vercel/next.js) from 15.0.4 to 15.1.2.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v15.0.4...v15.1.2)

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

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

demo/nextjs/package.json

@@ -65,7 +65,7 @@
     "lucide-react": "^0.439.0",
     "mini-svg-data-uri": "^1.4.4",
     "mysql2": "^3.11.5",
-    "next": "15.0.0-rc.1",
+    "next": "15.1.2",
     "next-themes": "^0.3.0",
     "prisma": "^5.22.0",
     "react": "^18.3.1",