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

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
     "style-loader": "^0.20.3",
     "webpack": "^4.5.0",
     "webpack-cli": "^2.0.14",
-    "webpack-dev-server": "^3.1.3",
+    "webpack-dev-server": "^5.0.0",
     "webpack-merge": "^4.1.2"
   },
   "dependencies": {