build(deps): bump xmldom and gulp-iconfont

Removes [xmldom](https://github.com/xmldom/xmldom). It's no longer used after updating ancestor dependency [gulp-iconfont](https://github.com/nfroidure/gulp-iconfont). These dependencies need to be updated together.


Removes `xmldom`

Updates `gulp-iconfont` from 10.0.3 to 12.0.0
- [Release notes](https://github.com/nfroidure/gulp-iconfont/releases)
- [Changelog](https://github.com/nfroidure/gulp-iconfont/blob/main/CHANGELOG.md)
- [Commits](nfroidure/gulp-iconfont@v10.0.3...v12.0.0)

---
updated-dependencies:
- dependency-name: xmldom
  dependency-type: indirect
- dependency-name: gulp-iconfont
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>