Bump ws and @twilio/voice-sdk in /apps/caller

Removes [ws](https://github.com/websockets/ws). It's no longer used after updating ancestor dependency [@twilio/voice-sdk](https://github.com/twilio/twilio-voice.js). These dependencies need to be updated together.


Removes `ws`

Updates `@twilio/voice-sdk` from 2.1.1 to 2.11.1
- [Release notes](https://github.com/twilio/twilio-voice.js/releases)
- [Changelog](https://github.com/twilio/twilio-voice.js/blob/master/CHANGELOG.md)
- [Commits](twilio/twilio-voice.js@2.1.1...2.11.1)

---
updated-dependencies:
- dependency-name: ws
  dependency-type: indirect
- dependency-name: "@twilio/voice-sdk"
  dependency-type: direct:production
...

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

Author: dependabot[bot]