Bumps [sass](https://github.com/sass/dart-sass) from 1.27.0 to 1.28.0.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.27.0...1.28.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>