Upgrading to Webpack 4.22.0 which has a fix for ordering problems

This was causing a test to behave differently before and after 4.22.0

Author: weaverryan

package.json

@@ -46,7 +46,7 @@
     "style-loader": "^1.1.3",
     "terser-webpack-plugin": "^1.1.0",
     "tmp": "^0.0.33",
-    "webpack": "^4.20.0",
+    "webpack": "^4.22.0",
     "webpack-cli": "^3.0.0",
     "webpack-dev-server": "^3.1.14",
     "webpack-manifest-plugin": "^2.0.2",

yarn.lock

@@ -8872,7 +8872,7 @@ webpack-sources@^1.1.0, webpack-sources@^1.3.0, webpack-sources@^1.4.0, webpack-
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@^4.20.0:
+webpack@^4.22.0:
   version "4.43.0"
   resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.43.0.tgz#c48547b11d563224c561dad1172c8aa0b8a678e6"
   integrity sha512-GW1LjnPipFW2Y78OOab8NJlCflB7EFskMih2AHdvjbpKMeDJqEgSx24cXXXiPS65+WSwVyxtDsJH6jGX2czy+g==