Bump mini-css-extract-plugin from 2.9.3 to 2.9.4

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.9.3 to 2.9.4.
- [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/v2.9.3...v2.9.4)

---
updated-dependencies:
- dependency-name: mini-css-extract-plugin
  dependency-version: 2.9.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -55,7 +55,7 @@
     "eslint-webpack-plugin": "^5.0.2",
     "file-loader": "^6.2.0",
     "lato-font": "^3.0.0",
-    "mini-css-extract-plugin": "^2.9.3",
+    "mini-css-extract-plugin": "^2.9.4",
     "postcss": "^8.5.6",
     "postcss-loader": "^8.1.1",
     "postcss-scss": "^4.0.9",