Bump css-loader from 3.6.0 to 5.2.6 (#2871)

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.6.0 to 5.2.6.
- [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/v3.6.0...v5.2.6)

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package.json

@@ -312,7 +312,7 @@
     "color": "^3.1.2",
     "concurrently": "^5.2.0",
     "css-element-queries": "^1.2.3",
-    "css-loader": "^3.5.3",
+    "css-loader": "^5.2.6",
     "deepdash": "^5.3.5",
     "dompurify": "^2.0.11",
     "electron": "^9.4.4",