Update dependency postcss-selector-parser to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-selector-parser	^5.0.0-rc.3 -> ^7.0.0

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Release Notes

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

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

v6.0.10

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• Fixed: isPseudoElement() supports :first-letter and :first-line

v6.0.9

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• Fixed: Combinator.raws property type

v6.0.8

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• Fixed: reduced size

v6.0.7

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• Fixed: parse animation percents

v6.0.6

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• Fixed: parse quoted attributes containing a newline correctly

v6.0.5

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• Perf: rework unesc for a 63+% performance boost

v6.0.4

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• Fixed: ts errors

v6.0.3

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• Fixed: replace node built-in "util" module with "util-deprecate"
• Fixed: handle uppercase pseudo elements
• Fixed: do not create invalid combinator before comment

v6.0.2

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• Fixed an issue with parsing and stringifying an empty attribute value

v6.0.1

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

v6.0.0

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• Updated: cssesc to 3.0.0 (major)
• Fixed: Issues with escaped id and class selectors

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