build(deps): bump engine.io from 6.6.4 to 6.6.9

Bumps [engine.io](https://github.com/socketio/socket.io) from 6.6.4 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@6.6.4...engine.io@6.6.9)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-version: 6.6.9
  dependency-type: indirect
...

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

Author: dependabot[bot]