Bump mini-css-extract-plugin from 2.2.0 to 2.3.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.2.0 to 2.3.0.
- [Release notes](https://github.com/webpack-contrib/mini-css-extract-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/mini-css-extract-plugin/compare/v2.2.0...v2.3.0)

---
updated-dependencies:
- dependency-name: mini-css-extract-plugin
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -174,7 +174,7 @@
     "jsdom": "^16.6.0",
     "json-loader": "^0.5.7",
     "listr": "^0.14.3",
-    "mini-css-extract-plugin": "^2.2.0",
+    "mini-css-extract-plugin": "^2.3.0",
     "node-loader": "^2.0.0",
     "node-sass": "^6.0.1",
     "prettier": "^2.3.2",

yarn.lock

@@ -8813,10 +8813,10 @@ min-indent@^1.0.0:
   resolved "https://registry.yarnpkg.com/min-indent/-/min-indent-1.0.1.tgz#a63f681673b30571fbe8bc25686ae746eefa9869"
   integrity sha512-I9jwMn07Sy/IwOj3zVkVik2JTvgpaykDZEigL6Rx6N9LbMywwUSMtxET+7lVoDLLd3O3IXwJwvuuns8UB/HeAg==
 
-mini-css-extract-plugin@^2.2.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.2.0.tgz#48cb6d2bea8fa9eb36709856e003662eebb3eb92"
-  integrity sha512-91HeVHbq7PUJ4TwOuMTlFWfVWrLqf3SF0PlEDPV+wtgsfxrMebN9LLzflyQqdKLp4/H3PexRB1WLKsCqpWKkxQ==
+mini-css-extract-plugin@^2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.3.0.tgz#87515f185533752944d753ac7216fc876779dafe"
+  integrity sha512-uzWaOwC+gJrnKbr23J1ZRWx/Wd9W9Ce1mKPlsBGBV/r8zG7/G7oKMxGmxbI65pVGbae2cR7CUx9Ulk0HQt8BfQ==
   dependencies:
     schema-utils "^3.1.0"