chore(deps): update dependency stylelint-config-standard to v21 (#3777)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -170,7 +170,7 @@
     "stylelint": "^13.0.0",
     "stylelint-config-prettier": "^8.0.0",
     "stylelint-config-rational-order": "^0.1.2",
-    "stylelint-config-standard": "^20.0.0",
+    "stylelint-config-standard": "^21.0.0",
     "stylelint-declaration-block-no-ignored-properties": "^2.1.0",
     "stylelint-order": "^4.0.0",
     "terser-webpack-plugin": "^3.0.3",