Bump stylelint-config-standard from 20.0.0 to 21.0.0

Bumps [stylelint-config-standard](https://github.com/stylelint/stylelint-config-standard) from 20.0.0 to 21.0.0.
- [Release notes](https://github.com/stylelint/stylelint-config-standard/releases)
- [Changelog](https://github.com/stylelint/stylelint-config-standard/blob/master/CHANGELOG.md)
- [Commits](stylelint/stylelint-config-standard@20.0.0...21.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

packages/lint-config-styles/package.json

@@ -17,6 +17,6 @@
 		"stylelint": "^13.0.0",
 		"stylelint-config-css-modules": "^2.2.0",
 		"stylelint-config-prettier": "^8.0.2",
-		"stylelint-config-standard": "^20.0.0"
+		"stylelint-config-standard": "^21.0.0"
 	}
 }