Update dependency mini-css-extract-plugin to v0.12.0

Author: renovate-bot

package.json

@@ -75,7 +75,7 @@
     "eslint-plugin-prettier": "3.1.4",
     "file-loader": "6.0.0",
     "gscan": "3.5.7",
-    "mini-css-extract-plugin": "0.9.0",
+    "mini-css-extract-plugin": "0.12.0",
     "node-sass": "4.14.1",
     "optimize-css-assets-webpack-plugin": "5.0.4",
     "postcss": "7.0.35",

yarn.lock

@@ -5775,10 +5775,10 @@ mimic-fn@^2.1.0:
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-2.1.0.tgz#7ed2c2ccccaf84d3ffcb7a69b57711fc2083401b"
   integrity sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==
 
-mini-css-extract-plugin@0.9.0:
-  version "0.9.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.9.0.tgz#47f2cf07aa165ab35733b1fc97d4c46c0564339e"
-  integrity sha512-lp3GeY7ygcgAmVIcRPBVhIkf8Us7FZjA+ILpal44qLdSu11wmjKQ3d9k15lfD7pO4esu9eUIAW7qiYIBppv40A==
+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"