fix(deps): update dependency file-loader to v6 (#58)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package-lock.json

@@ -53,7 +53,7 @@
     "eslint-plugin-jsx-a11y": "6.2.3",
     "eslint-plugin-react": "7.19.0",
     "eslint-plugin-react-hooks": "1.7.0",
-    "file-loader": "4.3.0",
+    "file-loader": "6.0.0",
     "html-webpack-new-relic-plugin": "1.1.0",
     "html-webpack-plugin": "3.2.0",
     "identity-obj-proxy": "3.0.0",