chore(deps): update dependency webpack-dev-server to v4

Author: renovate[bot]

package.json

@@ -48,7 +48,7 @@
     "terser-webpack-plugin": "1.4.5",
     "webpack": "4.46.0",
     "webpack-cli": "3.3.12",
-    "webpack-dev-server": "3.11.3",
+    "webpack-dev-server": "4.11.1",
     "webpack-obfuscator": "0.28.5",
     "semantic-release": "17.4.7"
   },