Bump engine.io from 3.5.0 to 6.4.0

Bumps [engine.io](https://github.com/socketio/engine.io) from 3.5.0 to 6.4.0.
- [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...6.4.0)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: indirect
...

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Author: dependabot[bot]