Bump css-loader from 0.28.9 to 0.28.11

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 0.28.9 to 0.28.11.
- [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@v0.28.9...v0.28.11)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support