Bump css-loader from 4.0.0 to 4.1.0

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 4.0.0 to 4.1.0.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-loader@v4.0.0...v4.1.0)

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