Bump engine.io from 6.1.3 to 6.2.1 in /packages/diffhtml-static-sync (#…

…288)

Bumps [engine.io](https://github.com/socketio/engine.io) from 6.1.3 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](socketio/engine.io@6.1.3...6.2.1)

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

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