Cohere commands do not work when reponse_format is specified

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hi,

when you add the propeorty reponse_format to a request when using any cohere model, it fails.

This is the request:

 curl -X POST "https://models.inference.ai.azure.com/chat/completions" \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $GITHUB_TOKEN" \
    -d '{
        "messages": [

            {
                "role": "user",
                "content": "Can you explain the basics of machine learning?"
            }
        ],
        "model": "Cohere-command-r",
        "temperature": 0.8,
        "max_tokens": 2048,
        "top_p": 0.1,
        "response_format": {"type": "text"}
    }'

this is the error:

{"error":{"code":"Bad Request","message":"{\"message\":\"invalid type: parameter response_format is of type object but should be of type string.\"}","status":400}}

I tried with the other models from other vendors and it just works

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