test(work): 补充测试用例

Author: fudiwei

src/SKIT.FlurlHttpClient.Wechat.Work/ExtendedSDK/Finance/Models/DecryptChatRecordResponse.cs

@@ -105,6 +105,10 @@ public class VoIPDocumentShareMessage : Abstractions.VoIPDocumentShareMessage
             {
             }
 
+            public class ExternalRedPacketMessage : Abstractions.ExternalRedPacketMessage
+            {
+            }
+
             public class ChannelsFeedMessage : Abstractions.ChannelsFeedMessage
             {
             }

src/SKIT.FlurlHttpClient.Wechat.Work/ExtendedSDK/Finance/Models/__Abstractions/ChatMessage.cs

@@ -932,6 +932,10 @@ public class VoIPDocumentShareMessage : ChatMessageBase
         public int FileSize { get; set; }
     }
 
+    public class ExternalRedPacketMessage : RedPacketMessage
+    {
+    }
+
     public class ChannelsFeedMessage : ChatMessageBase
     {
         /// <summary>