fix(deps): update dependency postcss-nested to v4.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
postcss-nested	dependencies	minor	4.1.0 -> 4.2.1

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Release Notes

postcss/postcss-nested

### [`v4.2.1`](https://togithub.com/postcss/postcss-nested/blob/master/CHANGELOG.md#​421) [Compare Source](https://togithub.com/postcss/postcss-nested/compare/4.2.0...4.2.1) - Fix TypeScript definitions (by Avi Vahl). ### [`v4.2.0`](https://togithub.com/postcss/postcss-nested/compare/4.1.2...4.2.0) [Compare Source](https://togithub.com/postcss/postcss-nested/compare/4.1.2...4.2.0) ### [`v4.1.2`](https://togithub.com/postcss/postcss-nested/blob/master/CHANGELOG.md#​412) [Compare Source](https://togithub.com/postcss/postcss-nested/compare/4.1.1...4.1.2) - Improve error messsage on broken selector ### [`v4.1.1`](https://togithub.com/postcss/postcss-nested/blob/master/CHANGELOG.md#​411) [Compare Source](https://togithub.com/postcss/postcss-nested/compare/4.1.0...4.1.1) - Add `&(:hover)` support (by Ben Delarre).

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