Update dependency webpack to v5

Author: renovate[bot]

package.json

@@ -21,7 +21,7 @@
     "html-webpack-plugin": "^3.2.0",
     "less-loader": "^4.1.0",
     "style-loader": "^0.23.1",
-    "webpack": "^4.20.2",
+    "webpack": "^5.0.0",
     "webpack-bundle-analyzer": "^3.0.3",
     "webpack-cli": "^3.1.2"
   },