Bump stylelint-webpack-plugin from 2.1.0 to 2.1.1

Bumps [stylelint-webpack-plugin](https://github.com/webpack-contrib/stylelint-webpack-plugin) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/webpack-contrib/stylelint-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/stylelint-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/stylelint-webpack-plugin/compare/v2.1.0...v2.1.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>