I updated the pydantic version and code is breaking with the error

Field 'allowed_type' defined on a base class was overridden by a non-annotated attribute. All field
definitions, including overrides, require a type
annotation.

class AllowedType(str, Enum):
    YES = "YES"
    NO = "NO"

class APIResponse(BaseModel):
    allowed_type: AllowedType
    def to_json(self):
        return json.dumps(
            {
                "allowed_type": self.allowed_type,
            }
        )

None of the solutions mentioned here work for me : /2.6/errors/usage_errors/#model-field-overridden