fix: zhipuai validate error when user's api key not support for chatglm_turbo in issue #6289 (#6290)

api/core/model_runtime/model_providers/zhipuai/zhipuai.py

             model_instance = self.get_model_instance(ModelType.LLM)
 
             model_instance.validate_credentials(
-                model='chatglm_turbo',
+                model='glm-4',
                 credentials=credentials
             )
         except CredentialsValidateFailedError as ex: