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>

package.json

@@ -84,7 +84,7 @@
     "stylelint-config-cmyr": "^0.2.1",
     "stylelint-config-rational-order": "^0.1.2",
     "stylelint-config-sass-guidelines": "^8.0.0",
-    "stylelint-config-standard": "^20.0.0",
+    "stylelint-config-standard": "^21.0.0",
     "stylelint-order": "^4.1.0",
     "stylelint-scss": "^3.18.0",
     "typescript": "^4.1.3",