build(deps-dev): bump stylelint-webpack-plugin from 2.1.0 to 2.1.1

Bumps [stylelint-webpack-plugin](https://github.com/webpack-contrib/stylelint-webpack-plugin) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/webpack-contrib/stylelint-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/stylelint-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack/stylelint-webpack-plugin@v2.1.0...v2.1.1)

---
updated-dependencies:
- dependency-name: stylelint-webpack-plugin
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -92,7 +92,7 @@
     "stylelint": "^13.7.1",
     "stylelint-config-recommended-scss": "^4.2.0",
     "stylelint-scss": "^3.18.0",
-    "stylelint-webpack-plugin": "^2.1.0",
+    "stylelint-webpack-plugin": "^2.1.1",
     "url-loader": "^4.1.0",
     "vue-loader": "^15.9.3",
     "vue-template-compiler": "^2.6.12",