Fix broken test

Author: DylanRussell

util/opentelemetry-util-genai/tests/test_upload.py

@@ -18,6 +18,7 @@
 import logging
 import sys
 import threading
+import time
 from contextlib import contextmanager
 from typing import Any
 from unittest import TestCase
@@ -155,7 +156,7 @@ def test_upload_then_shutdown(self):
         )
         # all items should be consumed
         self.hook.shutdown()
-
+        time.sleep(2)
         self.assertEqual(
             self.mock_fs.open.call_count,
             3,