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

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss-selector-parser	^6.0.6 → ^7.1.1

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Release Notes

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

v7.1.1

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• perf: replace startsWith with strict equality (#​308)
• fix(types): add walkUniversal declaration (#​311)

v7.1.0

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• feat: insert(Before|After) support multiple new node

v7.0.0

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• Feat: make insertions during iteration safe (major)

v6.1.2

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• Fixed: erroneous trailing combinators in pseudos

v6.1.1

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

v6.1.0

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• Feature: add sourceIndex to Selector nodes (#​290)

v6.0.16

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• Fixed: add missing index argument to each/walk callback types (#​289)

v6.0.15

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• Fixed: Node#prev and Node#next type for the first/last node

v6.0.14

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• Fixed: type definitions

v6.0.13

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• Fixed: throw on unexpected pipe symbols

v6.0.12

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• Fixed: clone arguments should be optional

v6.0.11

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• Fixed: parse attribute case insensitivity flag

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