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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-selector-parser	^6.0.9 -> ^7.0.0

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Release Notes

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

v7.0.0

Compare Source

• Feat: make insertions during iteration safe (major)

v6.1.2

Compare Source

• Fixed: erroneous trailing combinators in pseudos

v6.1.1

Compare Source

• Fixed: improve typings of constructor helpers (#​292)

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