fix(deps): update dependency postcss-selector-parser to v7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-selector-parser	^6.1.0 -> ^7.0.0

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Release Notes

postcss/postcss-selector-parser (postcss-selector-parser)

### [`v7.0.0`](https://redirect.github.com/postcss/postcss-selector-parser/blob/HEAD/CHANGELOG.md#700) [Compare Source](https://redirect.github.com/postcss/postcss-selector-parser/compare/v6.1.2...v7.0.0) - Feat: make insertions during iteration safe (major)

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Latest commit: 4e53f55ab371ebd44ca90ccbe7458098eced595b

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