build: bump vite from 7.1.9 to 7.1.12 in /demo

Bumps [vite](https://github.com/vitejs/vite/tree/HEAD/packages/vite) from 7.1.9 to 7.1.12.
- [Release notes](https://github.com/vitejs/vite/releases)
- [Changelog](https://github.com/vitejs/vite/blob/v7.1.12/packages/vite/CHANGELOG.md)
- [Commits](https://github.com/vitejs/vite/commits/v7.1.12/packages/vite)

---
updated-dependencies:
- dependency-name: vite
  dependency-version: 7.1.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

demo/package-lock.json

@@ -18,7 +18,7 @@
     "autoprefixer": "^10.4.21",
     "prettier": "^3.6.2",
     "tailwindcss": "^4.1.14",
-    "vite": "^7.1.9",
+    "vite": "^7.1.12",
     "vite-plugin-node-polyfills": "^0.24.0"
   },
   "dependencies": {