fix(deps): upgrade webpack-dev-server to v5, fix security warning (#11410)

Author: slorber

packages/docusaurus/package.json

@@ -73,7 +73,7 @@
     "update-notifier": "^6.0.2",
     "webpack": "^5.95.0",
     "webpack-bundle-analyzer": "^4.10.2",
-    "webpack-dev-server": "^4.15.2",
+    "webpack-dev-server": "^5.2.2",
     "webpack-merge": "^6.0.1"
   },
   "devDependencies": {