Update dependency webpack to v5

Author: renovate-bot

package.json

@@ -44,7 +44,7 @@
     "@babel/core": "7.6.4",
     "@babel/preset-env": "7.6.3",
     "jest": "24.9.0",
-    "webpack": "4.41.2",
+    "webpack": "5.21.2",
     "jsdom": "15.2.0",
     "webpack-cli": "3.3.9"
   },