Bump engine.io and socket.io in /lab

Bumps [engine.io](https://github.com/socketio/engine.io) to 3.6.1 and updates ancestor dependency [socket.io](https://github.com/socketio/socket.io). These dependencies need to be updated together.


Updates `engine.io` from 3.5.0 to 3.6.1
- [Release notes](https://github.com/socketio/engine.io/releases)
- [Changelog](https://github.com/socketio/engine.io/blob/main/CHANGELOG.md)
- [Commits](socketio/engine.io@3.5.0...3.6.1)

Updates `socket.io` from 2.4.0 to 2.5.0
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/main/CHANGELOG.md)
- [Commits](socketio/socket.io@2.4.0...2.5.0)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: indirect
- dependency-name: socket.io
  dependency-type: direct:production
...

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

lab/package.json

@@ -33,7 +33,7 @@
     "request": "^2.88.2",
     "request-promise": "^4.2.5",
     "serve-favicon": "^2.3.0",
-    "socket.io": "^2.4.0",
+    "socket.io": "^2.5.0",
     "ws": "^5.2.3"
   },
   "devDependencies": {