Bump mini-css-extract-plugin from 1.3.9 to 1.4.1 (#6917)

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.3.9 to 1.4.1.
- [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@v1.3.9...v1.4.1)

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package.json

@@ -147,7 +147,7 @@
     "license-checker": "^25.0.1",
     "lint-staged": "^10.5.1",
     "lite-server": "^2.6.1",
-    "mini-css-extract-plugin": "^1.3.9",
+    "mini-css-extract-plugin": "^1.4.1",
     "nconf": "^0.11.1",
     "ng-packagr": "^10.1.2",
     "optimize-css-assets-webpack-plugin": "^5.0.4",