Fix import sorting in test_steal.py

Signed-off-by: prince8273 <princesingh29757@gmail.com>

Author: prince8273

distributed/tests/test_steal.py

@@ -12,6 +12,7 @@
 from operator import mul
 from time import sleep
 from unittest.mock import patch
+
 import pytest
 from tlz import merge, sliding_window