Update dependency postcss-nested to v7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-nested	^6.0.0 -> ^7.0.0

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Release Notes

postcss/postcss-nested (postcss-nested)

### [`v7.0.2`](https://redirect.github.com/postcss/postcss-nested/blob/HEAD/CHANGELOG.md#702) [Compare Source](https://redirect.github.com/postcss/postcss-nested/compare/7.0.1...7.0.2) - Fixed nested selector regression (by [@​Ulyanov-programmer](https://redirect.github.com/Ulyanov-programmer)). ### [`v7.0.1`](https://redirect.github.com/postcss/postcss-nested/blob/HEAD/CHANGELOG.md#701) [Compare Source](https://redirect.github.com/postcss/postcss-nested/compare/7.0.0...7.0.1) - Fixed RegExp issue with nested comments (by [@​Ulyanov-programmer](https://redirect.github.com/Ulyanov-programmer)). ### [`v7.0.0`](https://redirect.github.com/postcss/postcss-nested/blob/HEAD/CHANGELOG.md#700) [Compare Source](https://redirect.github.com/postcss/postcss-nested/compare/6.2.0...7.0.0) - More complex logic of when to move comments (by [@​Ulyanov-programmer](https://redirect.github.com/Ulyanov-programmer)). - Removed Node.js 16, 14, and 12 support.

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Configuration

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