Update dependency css-loader to v3.6.0

Author: renovate-bot

package.json

@@ -94,7 +94,7 @@
     "clean-webpack-plugin": "3.0.0",
     "connect-history-api-fallback": "1.6.0",
     "cross-env": "7.0.2",
-    "css-loader": "3.5.3",
+    "css-loader": "3.6.0",
     "enzyme": "3.11.0",
     "enzyme-adapter-react-16": "1.15.2",
     "eslint": "6.8.0",