Bump css-loader from 5.1.2 to 5.1.3 (#570)

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 5.1.2 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@v5.1.2...v5.1.3)

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Author: dependabot[bot]

package.json

@@ -20,7 +20,7 @@
     "autoprefixer": "10.2.5",
     "clean-webpack-plugin": "3.0.0",
     "cross-env": "7.0.3",
-    "css-loader": "5.1.2",
+    "css-loader": "5.1.3",
     "fibers": "5.0.0",
     "mini-css-extract-plugin": "1.3.9",
     "postcss": "8.2.8",