Small fix for IChannel.GetUsersAsync

src/Discord.Net.WebSocket/Entities/Channels/SocketCategoryChannel.cs

@@ -62,7 +62,7 @@ namespace Discord.WebSocket
 
         //IChannel
         IAsyncEnumerable<IReadOnlyCollection<IUser>> IChannel.GetUsersAsync(CacheMode mode, RequestOptions options)
-            => ImmutableArray.Create<IReadOnlyCollection<IGuildUser>>(Users).ToAsyncEnumerable();
+            => ImmutableArray.Create<IReadOnlyCollection<IUser>>(Users).ToAsyncEnumerable();
         Task<IUser> IChannel.GetUserAsync(ulong id, CacheMode mode, RequestOptions options)
             => Task.FromResult<IUser>(GetUser(id));
     }