Bump mini-css-extract-plugin from 0.7.0 to 0.9.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 0.7.0 to 0.9.0.
- [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/v0.7.0...v0.9.0)

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

package.json

@@ -45,7 +45,7 @@
     "koa-static": "^5.0.0",
     "koa-views": "^6.1.4",
     "kue": "^0.11.6",
-    "mini-css-extract-plugin": "^0.7.0",
+    "mini-css-extract-plugin": "^0.9.0",
     "node-sass": "^4.13.0",
     "nodebrainz": "^2.1.1",
     "pg": "^7.17.1",

yarn.lock

@@ -5042,10 +5042,10 @@ mimic-fn@^2.0.0:
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-2.1.0.tgz#7ed2c2ccccaf84d3ffcb7a69b57711fc2083401b"
   integrity sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==
 
-mini-css-extract-plugin@^0.7.0:
-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.7.0.tgz#5ba8290fbb4179a43dd27cca444ba150bee743a0"
-  integrity sha512-RQIw6+7utTYn8DBGsf/LpRgZCJMpZt+kuawJ/fju0KiOL6nAaTBNmCJwS7HtwSCXfS47gCkmtBFS7HdsquhdxQ==
+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==
   dependencies:
     loader-utils "^1.1.0"
     normalize-url "1.9.1"