Update dependency file-loader to v6

package.json

@@ -36,7 +36,7 @@
     "bootstrap-loader": "3.0.4",
     "clean-webpack-plugin": "3.0.0",
     "css-loader": "3.6.0",
-    "file-loader": "4.3.0",
+    "file-loader": "6.0.0",
     "postcss-loader": "3.0.0",
     "react-hot-loader": "4.12.21",
     "react-router-dom": "5.2.0",

yarn.lock

@@ -2046,13 +2046,13 @@ figgy-pudding@^3.5.1:
   resolved "https://registry.yarnpkg.com/figgy-pudding/-/figgy-pudding-3.5.2.tgz#b4eee8148abb01dcf1d1ac34367d59e12fa61d6e"
   integrity sha512-0btnI/H8f2pavGMN8w40mlSKOfTK2SVJmBfBeVIj3kNw0swwgzyRq0d5TJVOwodFmtvpPeWPN/MCcfuWF0Ezbw==
 
-file-loader@4.3.0:
-  version "4.3.0"
-  resolved "https://registry.yarnpkg.com/file-loader/-/file-loader-4.3.0.tgz#780f040f729b3d18019f20605f723e844b8a58af"
-  integrity sha512-aKrYPYjF1yG3oX0kWRrqrSMfgftm7oJW5M+m4owoldH5C51C0RkIwB++JbRvEW3IU6/ZG5n8UvEcdgwOt2UOWA==
+file-loader@6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/file-loader/-/file-loader-6.0.0.tgz#97bbfaab7a2460c07bcbd72d3a6922407f67649f"
+  integrity sha512-/aMOAYEFXDdjG0wytpTL5YQLfZnnTmLNjn+AIrJ/6HVnTfDqLsVKUUwkDf4I4kgex36BvjuXEn/TX9B/1ESyqQ==
   dependencies:
-    loader-utils "^1.2.3"
-    schema-utils "^2.5.0"
+    loader-utils "^2.0.0"
+    schema-utils "^2.6.5"
 
 file-uri-to-path@1.0.0:
   version "1.0.0"
@@ -4363,7 +4363,7 @@ schema-utils@^1.0.0:
     ajv-errors "^1.0.0"
     ajv-keywords "^3.1.0"
 
-schema-utils@^2.5.0, schema-utils@^2.6.1, schema-utils@^2.6.5, schema-utils@^2.6.6:
+schema-utils@^2.6.1, schema-utils@^2.6.5, schema-utils@^2.6.6:
   version "2.6.6"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-2.6.6.tgz#299fe6bd4a3365dc23d99fd446caff8f1d6c330c"
   integrity sha512-wHutF/WPSbIi9x6ctjGGk2Hvl0VOz5l3EKEuKbjPlB30mKZUzb9A5k9yEXRX3pwyqVLPvpfZZEllaFq/M718hA==