chore(deps): update dependency webpack-dev-server to v5 [security]

Author: renovate[bot]

package.json

@@ -50,7 +50,7 @@
     "url-loader": "^4.1.0",
     "webpack": "^4.0.0",
     "webpack-cli": "^4.0.0",
-    "webpack-dev-server": "^3.0.0",
+    "webpack-dev-server": "^5.0.0",
     "webpack-node-externals": "^2.5.0"
   },
   "homepage": "https://identity.netlify.com",