Update dependency clean-webpack-plugin to v4

Author: renovate-bot

package.json

@@ -95,7 +95,7 @@
     "babel-plugin-lodash": "3.3.4",
     "babel-preset-react-optimize": "1.0.1",
     "browserslist": "4.18.1",
-    "clean-webpack-plugin": "3.0.0",
+    "clean-webpack-plugin": "4.0.0",
     "connect-history-api-fallback": "1.6.0",
     "cross-env": "7.0.3",
     "css-loader": "3.6.0",

yarn.lock

@@ -1884,7 +1884,7 @@
     "@types/source-list-map" "*"
     source-map "^0.7.3"
 
-"@types/webpack@^4.4.31", "@types/webpack@^4.41.8":
+"@types/webpack@^4.41.8":
   version "4.41.29"
   resolved "https://registry.yarnpkg.com/@types/webpack/-/webpack-4.41.29.tgz#2e66c1de8223c440366469415c50a47d97625773"
   integrity sha512-6pLaORaVNZxiB3FSHbyBiWM7QdazAWda1zvAq4SbZObZqHSDbWLi62iFdblVea6SK9eyBIVp5yHhKt/yNQdR7Q==
@@ -3377,12 +3377,11 @@ clean-stack@^2.0.0:
   resolved "https://registry.yarnpkg.com/clean-stack/-/clean-stack-2.2.0.tgz#ee8472dbb129e727b31e8a10a427dee9dfe4008b"
   integrity sha512-4diC9HaTE+KRAMWhDhrGOECgWZxoevMc5TlkObMqNSsVU62PYzXZ/SMTjzyGAFF1YusgxGcSWTEXBhp0CPwQ1A==
 
-clean-webpack-plugin@3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/clean-webpack-plugin/-/clean-webpack-plugin-3.0.0.tgz#a99d8ec34c1c628a4541567aa7b457446460c62b"
-  integrity sha512-MciirUH5r+cYLGCOL5JX/ZLzOZbVr1ot3Fw+KcvbhUb6PM+yycqd9ZhIlcigQ5gl+XhppNmw3bEFuaaMNyLj3A==
+clean-webpack-plugin@4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/clean-webpack-plugin/-/clean-webpack-plugin-4.0.0.tgz#72947d4403d452f38ed61a9ff0ada8122aacd729"
+  integrity sha512-WuWE1nyTNAyW5T7oNyys2EN0cfP2fdRxhxnIQWiAp0bMabPdHhoGxM8A6YL2GhqwgrPnnaemVE7nv5XJ2Fhh2w==
   dependencies:
-    "@types/webpack" "^4.4.31"
     del "^4.1.1"
 
 cli-boxes@^2.2.1: