Bump css-loader from 0.28.10 to 3.2.0

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 0.28.10 to 3.2.0.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack/css-loader@v0.28.10...v3.2.0)

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Author: dependabot-preview[bot]