Bump vite from 5.0.11 to 5.4.21 in /demo/frontend

Bumps [vite](https://github.com/vitejs/vite/tree/HEAD/packages/vite) from 5.0.11 to 5.4.21.
- [Release notes](https://github.com/vitejs/vite/releases)
- [Changelog](https://github.com/vitejs/vite/blob/v5.4.21/packages/vite/CHANGELOG.md)
- [Commits](https://github.com/vitejs/vite/commits/v5.4.21/packages/vite)

---
updated-dependencies:
- dependency-name: vite
  dependency-version: 5.4.21
  dependency-type: direct:development
...

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

demo/frontend/package.json

@@ -77,7 +77,7 @@
     "tailwindcss": "^3.3.3",
     "tsx": "^4.16.2",
     "typescript": ">=4.3.5 <5.4.0",
-    "vite": "^5.0.11",
+    "vite": "^5.4.21",
     "vite-plugin-babel": "^1.2.0",
     "vite-plugin-relay": "^2.0.0",
     "vite-plugin-stylex-dev": "^0.5.2"