修改邮件组 PATCH {{base_url}}/mail/v1/mailgroups/:mailgroup_id 更新邮件组部分字段，没有填写的字段不会被更新 参考接口文档：修改邮件组 Request Body {"description"=>"mail group for testing", "name"=>"test mail group", "who_can_send_mail"=>"ALL_INTERNAL_USERS"}