Bump vite from 5.4.21 to 6.4.2 in /app

Bumps [vite](https://github.com/vitejs/vite/tree/HEAD/packages/vite) from 5.4.21 to 6.4.2.
- [Release notes](https://github.com/vitejs/vite/releases)
- [Changelog](https://github.com/vitejs/vite/blob/v6.4.2/packages/vite/CHANGELOG.md)
- [Commits](https://github.com/vitejs/vite/commits/v6.4.2/packages/vite)

---
updated-dependencies:
- dependency-name: vite
  dependency-version: 6.4.2
  dependency-type: direct:development
...

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

Author: dependabot[bot]

app/package.json

@@ -31,7 +31,7 @@
     "@shoelace-style/shoelace": "^2.5.2",
     "@types/node": "^20.2.5",
     "shx": "^0.3.4",
-    "vite": "^5.4.21",
+    "vite": "^6.4.2",
     "vite-plugin-static-copy": "^2.3.2"
   },
   "repository": {