deps(renovate): update dependency postcss-selector-parser to v6.1.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-selector-parser	6.0.13 -> 6.1.2

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Release Notes

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

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

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