Bump ws, engine.io and socket.io-adapter

Bumps [ws](https://github.com/websockets/ws), [engine.io](https://github.com/socketio/socket.io) and [socket.io-adapter](https://github.com/socketio/socket.io). These dependencies needed to be updated together.

Updates `ws` from 8.18.3 to 8.21.0
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.18.3...8.21.0)

Updates `engine.io` from 6.6.6 to 6.6.9
- [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/engine.io@6.6.6...engine.io@6.6.9)

Updates `socket.io-adapter` from 2.5.6 to 2.5.8
- [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/socket.io-adapter@2.5.6...socket.io-adapter@2.5.8)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.21.0
  dependency-type: indirect
- dependency-name: engine.io
  dependency-version: 6.6.9
  dependency-type: indirect
- dependency-name: socket.io-adapter
  dependency-version: 2.5.8
  dependency-type: indirect
...

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Author: dependabot[bot]