Bump engine.io and socket.io in /API

Bumps [engine.io](https://github.com/socketio/engine.io) to 6.2.1 and updates ancestor dependency [socket.io](https://github.com/socketio/socket.io). These dependencies need to be updated together.


Updates `engine.io` from 4.1.2 to 6.2.1
- [Release notes](https://github.com/socketio/engine.io/releases)
- [Changelog](https://github.com/socketio/engine.io/blob/main/CHANGELOG.md)
- [Commits](https://github.com/socketio/engine.io/compare/4.1.2...6.2.1)

Updates `socket.io` from 3.1.1 to 4.5.3
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/main/CHANGELOG.md)
- [Commits](https://github.com/socketio/socket.io/compare/3.1.1...4.5.3)

---
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>

API/package.json

@@ -17,7 +17,7 @@
     "mongoose": "^5.11.17",
     "node-p5": "^1.0.3",
     "p5": "^1.2.0",
-    "socket.io": "^3.1.1"
+    "socket.io": "^4.5.3"
   },
   "devDependencies": {
     "nodemon": "^2.0.7"