Bumps [gulp-sass](https://github.com/dlmanning/gulp-sass) from 3.2.1 to 4.0.2.
- [Release notes](https://github.com/dlmanning/gulp-sass/releases)
- [Changelog](https://github.com/dlmanning/gulp-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dlmanning/gulp-sass/compare/v3.2.1...v4.0.2)
Signed-off-by: dependabot[bot] <support@dependabot.com>