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

Bumps [socket.io](https://github.com/socketio/socket.io) from 0.9.19 to 2.3.0.
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Commits](https://github.com/socketio/socket.io/compare/0.9.19...2.3.0)

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

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

@@ -7,7 +7,7 @@
     "express": "3.1.x",
     "connect": "*",
     "handlebars": "~1.0.9",
-    "socket.io": "~0.9.13",
+    "socket.io": "~2.3.0",
     "express3-handlebars": "~0.2.3"
   },
   "engines": {