Auto auto fix of rule F401

Author: notatallshaw

src/pip/_internal/operations/build/build_tracker.py

@@ -3,9 +3,8 @@
 import logging
 import os
 from types import TracebackType
-from typing import Dict, Generator, Optional, Set, Type, Union
+from typing import Dict, Generator, Optional, Type, Union
 
-from pip._internal.models.link import Link
 from pip._internal.req.req_install import InstallRequirement
 from pip._internal.utils.temp_dir import TempDirectory