fix: fix warnning

Author: ylsssssss

volcenginesdkllmshield/api/llm_shield_sdk_v2.py

@@ -196,7 +196,7 @@ class Config:
 # 定义错误信息结构体
 class ErrorInfo(BaseModel):
     code: str = Field("", alias="Code")
-    codeN: int = Field("", alias="CodeN")
+    codeN: Union[int, str] = Field("", alias="CodeN")
     message: str = Field("", alias="Message")
 
     class Config: