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

Author: renovate[bot]

{{ cookiecutter.project_slug }}/client/package.json

@@ -57,7 +57,7 @@
     "typescript": "3.8.3",
     "webpack": "4.42.1",
     "webpack-cli": "3.3.11",
-    "webpack-dev-server": "3.10.3"
+    "webpack-dev-server": "5.2.1"
   },
   "dependencies": {
     "@apollo/react-hooks": "3.1.4",