Make RevChatGPTChatbotConfigModel not frozen

Author: code-yeongyu

aishell/models/revchatgpt_chatbot_config_model.py

@@ -18,6 +18,3 @@ def check_at_least_one_account_info(cls, values: dict[str, Optional[str]]):
             raise ValueError('No information for authentication provided.')
 
         return values
-
-    class Config:
-        frozen = True