List deployed voices

curl --request GET \
  --url https://api.us.poly.ai/v1/agents/{agentId}/deployed-voices \
  --header 'x-api-key: <api-key>'

{
  "deployedVoices": [
    {
      "id": "<string>",
      "genaiProjectId": "<string>",
      "voiceId": "<string>",
      "probability": 123
    }
  ]
}