Same params as:
https://platform.openai.com/docs/api-reference/audio/createSpeech
curl -L \ --request POST \ --url '/audio/speech' \ --header 'Ocp-Apim-Subscription-Key: YOUR_API_KEY'
No body
curl -L \ --request POST \ --url '/v1/audio/speech' \ --header 'Ocp-Apim-Subscription-Key: YOUR_API_KEY'