Fix test_upload

Unused Import

Author: 1yam

tests/unit/test_upload.py

@@ -2,7 +2,7 @@
 from unittest.mock import AsyncMock, patch
 
 import pytest
-from aleph_message.models import AlephMessage, StoreMessage
+from aleph_message.models import StoreMessage
 from aleph_message.status import MessageStatus
 
 from aleph.sdk.chains.common import get_fallback_private_key