Update dependency webpack to v5

Author: renovate-bot

package.json

@@ -60,7 +60,7 @@
  "karma-webpack": "4.0.2",
  "mocha": "5.2.0",
  "sinon": "7.5.0",
- "webpack": "4.44.2",
+ "webpack": "5.1.3",
  "webpack-cli": "3.3.12",
  "webpack-common-shake": "2.1.0",
  "webpack-merge": "4.2.2"