[fix] Fix flake8 issue

Author: nabenabe0928

autoPyTorch/datasets/base_dataset.py

@@ -1,7 +1,7 @@
-from abc import ABCMeta
 import os
-from typing import Any, Dict, List, Optional, Sequence, Tuple, Union, cast
 import uuid
+from abc import ABCMeta
+from typing import Any, Dict, List, Optional, Sequence, Tuple, Union, cast
 
 import numpy as np