Bump mini-css-extract-plugin from 1.5.1 to 1.6.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.5.1 to 1.6.0.
- [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@v1.5.1...v1.6.0)

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

package.json

@@ -33,7 +33,7 @@
     "handlebars-loader": "^1.7.1",
     "jest": "^26.6.3",
     "jest-handlebars": "^1.0.1",
-    "mini-css-extract-plugin": "^1.3.9",
+    "mini-css-extract-plugin": "^1.6.0",
     "node-sass": "^5.0.0",
     "raw-loader": "^4.0.2",
     "sass": "^1.32.8",