chore: regenerate SDK for generator changes to support making JSON POST requests

[RJPearson94]

This change supports the multiple PR's to fix https://github.com/twilio/twilio-oai-generator/issues/49 where the SDK panics when trying to update a Flex Configuration.

This change relies on https://github.com/twilio/twilio-go/pull/83 being merged. The changes are not visible until https://github.com/twilio/twilio-oai/issues/36 is resolved

Checklist

• [x] I acknowledge that all my contributions will be made under the project's license
• [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
• [x] I have titled the PR appropriately
• [x] I have updated my branch with the main branch
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added the necessary documentation about the functionality in the appropriate .md file
• [ ] I have added inline documentation to the code I modified

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