Bump css-loader from 3.5.3 to 4.2.0 (#185)

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.5.3 to 4.2.0.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v3.5.3...v4.2.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -46,7 +46,7 @@
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^6.0.2",
     "copyfiles": "^2.3.0",
-    "css-loader": "^3.5.3",
+    "css-loader": "^4.2.0",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.11.0",
     "eslint-plugin-jest": "^23.13.2",