Bump mini-css-extract-plugin from 0.4.5 to 0.9.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 0.4.5 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](webpack-contrib/mini-css-extract-plugin@v0.4.5...v0.9.0)

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

package.json

@@ -76,7 +76,7 @@
     "lodash": "^4.17.10",
     "lru-cache": "^4.1.3",
     "lscache": "^1.3.0",
-    "mini-css-extract-plugin": "^0.4.2",
+    "mini-css-extract-plugin": "^0.9.0",
     "moment": "^2.22.2",
     "node-fetch": "^2.2.0",
     "node-sass": "^4.9.3",