Bump css-loader from 3.6.0 to 5.1.3

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.6.0 to 5.1.3.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-loader@v3.6.0...v5.1.3)

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

package.json

@@ -109,7 +109,7 @@
     "case-sensitive-paths-webpack-plugin": "^2.3.0",
     "copyfiles": "^2.4.1",
     "coveralls": "^3.1.0",
-    "css-loader": "^3.6.0",
+    "css-loader": "^5.1.3",
     "enzyme": "^3.11.0",
     "enzyme-adapter-react-16": "^1.15.6",
     "eslint": "^7.19.0",