Update dependency file-loader to v4.3.0

Author: renovate-bot

package.json

@@ -85,7 +85,7 @@
  "eslint-plugin-jest": "22.14.1",
  "eslint-plugin-prettier": "3.1.0",
  "eslint-watch": "6.0.0",
- "file-loader": "4.1.0",
+ "file-loader": "4.3.0",
  "html-webpack-plugin": "3.2.0",
  "husky": "3.0.2",
  "identity-obj-proxy": "3.0.0",