Update dependency html-webpack-plugin to v5

Author: renovate[bot]

Diff for: package.json

@@ -34,7 +34,7 @@
     "babel-plugin-istanbul": "5.2.0",
     "cross-env": "5.2.1",
     "cypress": "3.8.3",
-    "html-webpack-plugin": "3.2.0",
+    "html-webpack-plugin": "5.5.1",
     "istanbul-lib-coverage": "2.0.5",
     "nyc": "14.1.1",
     "script-ext-html-webpack-plugin": "2.1.5",