🌿 ✨ [Scheduled] Update API Spec (#222)

* feat(openapi): add chatgpt-4o-latest model and Cartesia voice controls

* feat(openapi): add test suite and test run schemas and DTOs

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Co-authored-by: fern-api[bot] <115122769+fern-api[bot]@users.noreply.github.com>

Author: fern-api[bot]