chore(deps-dev): bump mini-css-extract-plugin from 0.11.3 to 0.12.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 0.11.3 to 0.12.0.
- [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/v0.11.3...v0.12.0)

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

package.json

@@ -56,7 +56,7 @@
         "exports-loader": "^1.0.0",
         "file-loader": "^6.0.0",
         "git-revision-webpack-plugin": "^3.0.3",
-        "mini-css-extract-plugin": "0.11.3",
+        "mini-css-extract-plugin": "0.12.0",
         "node-sass": "^4.12.0",
         "postcss-loader": "^3.0.0",
         "prettier": "^2.0.4",

yarn.lock

@@ -5861,10 +5861,10 @@ min-document@^2.19.0:
   dependencies:
     dom-walk "^0.1.0"
 
-mini-css-extract-plugin@0.11.3:
-  version "0.11.3"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.11.3.tgz#15b0910a7f32e62ffde4a7430cfefbd700724ea6"
-  integrity sha512-n9BA8LonkOkW1/zn+IbLPQmovsL0wMb9yx75fMJQZf2X1Zoec9yTZtyMePcyu19wPkmFbzZZA6fLTotpFhQsOA==
+mini-css-extract-plugin@0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.12.0.tgz#ddeb74fd6304ca9f99c1db74acc7d5b507705454"
+  integrity sha512-z6PQCe9rd1XUwZ8gMaEVwwRyZlrYy8Ba1gRjFP5HcV51HkXX+XlwZ+a1iAYTjSYwgNBXoNR7mhx79mDpOn5fdw==
   dependencies:
     loader-utils "^1.1.0"
     normalize-url "1.9.1"