Bump stylelint from 13.8.0 to 13.9.0

Bumps [stylelint](https://github.com/stylelint/stylelint) from 13.8.0 to 13.9.0.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/stylelint/stylelint/compare/13.8.0...13.9.0)

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

package.json

@@ -55,7 +55,7 @@
     "sass": "^1.32.4",
     "sass-loader": "^10.1.1",
     "style-loader": "^2.0.0",
-    "stylelint": "^13.7.2",
+    "stylelint": "^13.9.0",
     "stylelint-config-standard": "^20.0.0",
     "stylelint-scss": "^3.18.0",
     "stylelint-webpack-plugin": "^2.1.1",