fix GroupReactionNotice crashing

Author: Inkarro

Lagrange.Core/Internal/Packets/Message/ContentHead.cs

@@ -15,7 +15,7 @@ internal class ContentHead
 
     [ProtoMember(4)] public long? Random { get; set; } 
 
-    [ProtoMember(5)] public uint? Sequence { get; set; }
+    [ProtoMember(5)] public ulong? Sequence { get; set; }
 
     [ProtoMember(6)] public long? Timestamp { get; set; }
 
@@ -32,4 +32,4 @@ internal class ContentHead
     [ProtoMember(12)] public ulong? MsgUid { get; set; }
 
     [ProtoMember(15)] public ForwardHead? Forward { get; set; }
-}
+}