BREAKING CHANGE: Update dependency file-loader to v6

Author: renovate-bot

package.json

@@ -40,7 +40,7 @@
     "elm-hot-webpack-loader": "1.1.7",
     "elm-test": "latest-0.19.1",
     "elm-webpack-loader": "6.0.1",
-    "file-loader": "1.1.11",
+    "file-loader": "6.1.0",
     "fs-extra": "6.0.1",
     "html-webpack-plugin": "4.5.0",
     "http-proxy-middleware": "0.21.0",