fix key

Author: AngeloGiacco

src/elevenlabs/conversational_ai/conversation.py

@@ -57,7 +57,7 @@ def __init__(self, text: str):
         self.text = text
 
     def to_dict(self) -> dict:
-        return {"type": self.type, "content": self.text}
+        return {"type": self.type, "text": self.text}
 
 
 class AudioInterface(ABC):