fix(deps): update dependency file-loader to v4

Author: renovate-bot

package.json

@@ -8,7 +8,7 @@
     "coverage": "cat coverage/*/lcov.info | codecov"
   },
   "dependencies": {
-    "file-loader": "2.0.0",
+    "file-loader": "4.0.0",
     "loader-utils": "1.2.3"
   },
   "repository": {