chore(deps): update dependency stylelint-config-standard to v21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylelint-config-standard	20.0.0 -> 21.0.0

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Release Notes

stylelint/stylelint-config-standard

### [`v21.0.0`](https://togithub.com/stylelint/stylelint-config-standard/blob/master/CHANGELOG.md#​2100) [Compare Source](https://togithub.com/stylelint/stylelint-config-standard/compare/20.0.0...21.0.0) - Removed: `stylelint` less than `13.12.0` from peer dependencies. - Changed: updated to [`stylelint-config-recommended@4.0.0`](https://togithub.com/stylelint/stylelint-config-recommended/releases/tag/4.0.0)

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