Fix linting

tests/unit/resolution_resolvelib/test_provider.py

@@ -2,6 +2,7 @@
 from typing import TYPE_CHECKING, Dict, Iterable, Optional, Sequence
 
 import pytest
+
 from pip._vendor.resolvelib.resolvers import RequirementInformation
 
 from pip._internal.models.candidate import InstallationCandidate