Update gulp-sass requirement to ^4.0.1
Update gulp-sass requirement to ^4.0.1

Updates the requirements on [gulp-sass](https://github.com/dlmanning/gulp-sass) to permit the latest version.
- [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/commits/v4.0.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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