Merge pull request #511 from halfzebra/renovate/css-loader-4.x

BREAKING CHANGE: Update dependency css-loader to v4

Author: halfzebra

package.json

@@ -33,7 +33,7 @@
     "copy-webpack-plugin": "5.1.2",
     "cosmiconfig": "5.2.1",
     "cross-spawn": "7.0.3",
-    "css-loader": "3.6.0",
+    "css-loader": "4.3.0",
     "dotenv": "8.2.0",
     "elm": "latest-0.19.1",
     "elm-asset-webpack-loader": "1.1.2",