Bump engine.io and pxt-common-packages

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


Updates `engine.io` from 3.2.1 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@3.2.1...6.2.1)

Updates `pxt-common-packages` from 9.0.1 to 9.5.12
- [Release notes](https://github.com/Microsoft/pxt-common-packages/releases)
- [Commits](microsoft/pxt-common-packages@v9.0.1...v9.5.12)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: indirect
- dependency-name: pxt-common-packages
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>