Fix new version task by using passthought manager

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/documents/tasks.py

@@ -142,7 +142,7 @@ def task_upload_new_version(self, document_id, shared_uploaded_file_id, user_id,
     )
 
     try:
-        document = Document.objects.get(pk=document_id)
+        document = Document.passthrough.get(pk=document_id)
         shared_file = SharedUploadedFile.objects.get(
             pk=shared_uploaded_file_id
         )