Bump xmlhttprequest-ssl and engine.io-client (#34)

Bumps [xmlhttprequest-ssl](https://github.com/mjwwit/node-XMLHttpRequest) and [engine.io-client](https://github.com/socketio/engine.io-client). These dependencies needed to be updated together.

Updates `xmlhttprequest-ssl` from 1.5.5 to 1.6.3
- [Release notes](https://github.com/mjwwit/node-XMLHttpRequest/releases)
- [Commits](mjwwit/node-XMLHttpRequest@1.5.5...1.6.3)

Updates `engine.io-client` from 3.5.1 to 3.5.3
- [Release notes](https://github.com/socketio/engine.io-client/releases)
- [Changelog](https://github.com/socketio/engine.io-client/blob/3.5.3/CHANGELOG.md)
- [Commits](socketio/engine.io-client@3.5.1...3.5.3)

---
updated-dependencies:
- dependency-name: xmlhttprequest-ssl
  dependency-type: indirect
- dependency-name: engine.io-client
  dependency-type: indirect
...

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>