Fix messages not being sent after attachment upload completes in background (#6324)

Co-authored-by: Claude <noreply@anthropic.com>

Author: VelikovPetar

stream-chat-android-client/src/main/java/io/getstream/chat/android/client/attachment/worker/UploadAttachmentsWorker.kt

@@ -87,6 +87,7 @@ public class UploadAttachmentsWorker(
 
         return if (!hasPendingAttachment) {
             logger.d { "[sendAttachments] #uploader; message ${message.id} doesn't have pending attachments" }
+            AttachmentsUploadStates.updateMessageAttachments(message)
             Result.Success(Unit)
         } else {
             val attachments = uploadAttachments(message)