Bump stylelint from 13.11.0 to 13.12.0

Bumps [stylelint](https://github.com/stylelint/stylelint) from 13.11.0 to 13.12.0.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/master/CHANGELOG.md)
- [Commits](stylelint/stylelint@13.11.0...13.12.0)

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

package.json

@@ -89,7 +89,7 @@
     "node-sass": "^5.0.0",
     "sass-loader": "^10.1.1",
     "style-loader": "^2.0.0",
-    "stylelint": "^13.11.0",
+    "stylelint": "^13.12.0",
     "stylelint-config-recommended-scss": "^4.2.0",
     "stylelint-scss": "^3.19.0",
     "stylelint-webpack-plugin": "^2.1.1",