chore(vara-ui): migrate to vite v6

[osipov-mit]

File Location(s)

No response

Proposal

@gear-js/vara-ui package build is failing with vite v6.

  [vite:dts] Start generate declaration files...
  computing gzip size...
  dist-temp/vara-ui.css  24.32 kB │ gzip:  4.59 kB
  dist-temp/vara-ui.js   32.41 kB │ gzip: 10.34 kB
  [vite:dts] Declaration files built in 2973ms.
  
  ✓ built in 4.03s
  cp: cannot stat 'dist-temp/style.css': No such file or directory

Should be migrated to this version. vite dependencies must be removed from utils/vara-ui/package.json as they are in the root package.json