chore(deps): bump socket.io in /tests/apps/.websocket.disabled

Bumps [socket.io](https://github.com/socketio/socket.io) from 3.1.2 to 4.0.0.
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/master/CHANGELOG.md)
- [Commits](https://github.com/socketio/socket.io/compare/3.1.2...4.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

tests/apps/.websocket.disabled/package.json

@@ -7,7 +7,7 @@
     "express": "4.17.x",
     "connect": "*",
     "handlebars": "~4.7.1",
-    "socket.io": "~3.1.0",
+    "socket.io": "~4.0.0",
     "express3-handlebars": "~0.5.2"
   },
   "engines": {