Update dependency css-loader to v5.2.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
css-loader	5.2.6 -> 5.2.7

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Release Notes

webpack-contrib/css-loader

### [`v5.2.7`](https://togithub.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md#​527-httpsgithubcomwebpack-contribcss-loadercomparev526v527-2021-07-13) [Compare Source](https://togithub.com/webpack-contrib/css-loader/compare/v5.2.6...v5.2.7)

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