build(deps-dev): bump mini-css-extract-plugin in /rest-ui (#216)

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 0.11.2 to 0.11.3.
- [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@v0.11.2...v0.11.3)

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rest-ui/package.json

@@ -41,7 +41,7 @@
     "html-webpack-plugin": "^4.5.0",
     "imports-loader": "^1.1.0",
     "lodash-es": "^4.17.15",
-    "mini-css-extract-plugin": "^0.11.2",
+    "mini-css-extract-plugin": "^0.11.3",
     "npm-run-all": "^4.1.5",
     "optimize-css-assets-webpack-plugin": "^5.0.4",
     "plugin-error": "^1.0.1",