Update dependency stylelint to v15.7.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylelint (source)	15.6.3 -> 15.7.0

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Release Notes

stylelint/stylelint

v15.7.0

Compare Source

• Added: splitList: boolean to selector-nested-pattern (#​6896) (@​is2ei).
• Fixed: unit-no-unknown false positives for unicode-range descriptors (#​6892) (@​romainmenke).
• Fixed: segmentation fault errors for Cosmiconfig 8.2 (#​6902) (@​romainmenke).

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