chore(deps): update dependency stylelint to v15.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylelint (source)	15.5.0 -> 15.6.0

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Release Notes

stylelint/stylelint

### [`v15.6.0`](https://togithub.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#​1560) [Compare Source](https://togithub.com/stylelint/stylelint/compare/15.5.0...15.6.0) - Added: `allowEmptyInput`, `cache`, `fix` options to configuration object ([#​6778](https://togithub.com/stylelint/stylelint/pull/6778)) ([@​mattxwang](https://togithub.com/mattxwang)). - Added: `ignore: ["with-var-inside"]` to `color-function-notation` ([#​6802](https://togithub.com/stylelint/stylelint/pull/6802)) ([@​mattxwang](https://togithub.com/mattxwang)). - Fixed: `declaration-block-no-duplicate-properties` autofix for 3 or more duplicates ([#​6801](https://togithub.com/stylelint/stylelint/pull/6801)) ([@​mattxwang](https://togithub.com/mattxwang)). - Fixed: `declaration-block-no-duplicate-properties` false positives with option `ignore: ["consecutive-duplicates-with-different-syntaxes"]` ([#​6797](https://togithub.com/stylelint/stylelint/pull/6797)) ([@​romainmenke](https://togithub.com/romainmenke)). - Fixed: `declaration-block-no-duplicate-properties` syntax error ([#​6792](https://togithub.com/stylelint/stylelint/pull/6792)) ([@​yoyo837](https://togithub.com/yoyo837)). - Fixed: `declaration-block-no-redundant-longhand-properties` autofix for `grid-template` ([#​6777](https://togithub.com/stylelint/stylelint/pull/6777)) ([@​mattxwang](https://togithub.com/mattxwang)). - Fixed: `function-url-quotes` autofix for comments in SCSS function ([#​6800](https://togithub.com/stylelint/stylelint/pull/6800)) ([@​ybiquitous](https://togithub.com/ybiquitous)).

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