Update dependency webpack-dev-server to v5 [SECURITY]

Author: renovate[bot]

www/package.json

@@ -22,6 +22,6 @@
     "copy-webpack-plugin": "^5.1.2",
     "webpack": "^4.44.2",
     "webpack-cli": "^3.3.12",
-    "webpack-dev-server": "^3.11.0"
+    "webpack-dev-server": "^5.0.0"
   }
 }