fix: Incorrect PhoneNumberCapabilities type

[Exotica0122]

Fixes

Maps the correct PhoneNumberCapabilities type from Twilio response

Closes:

#833

Checklist

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• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the Contribution Guidelines and my PR follows them
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• [ ] I have added tests that prove my fix is effective or that my feature works
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• [ ] I have added inline documentation to the code I modified

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