chore(deps): 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>

config/stylelint-config-carbon/package.json

@@ -28,7 +28,7 @@
   "dependencies": {
     "stylelint-config-prettier": "^8.0.1",
     "stylelint-config-rational-order": "^0.1.2",
-    "stylelint-config-standard": "^20.0.0",
+    "stylelint-config-standard": "^21.0.0",
     "stylelint-no-unsupported-browser-features": "^4.0.0",
     "stylelint-order": "^4.1.0",
     "stylelint-prettier": "^1.1.2",