Restyled by isort

src/python_testing/TC_OpstateCommon.py

@@ -27,7 +27,7 @@
 from chip.clusters.Attribute import EventReadResult, SubscriptionTransaction
 from chip.clusters.Types import NullValue
 from chip.interaction_model import InteractionModelError, Status
-from matter_testing_support import ClusterAttributeChangeAccumulator, EventChangeCallback, TestStep, MatterBaseTest
+from matter_testing_support import ClusterAttributeChangeAccumulator, EventChangeCallback, MatterBaseTest, TestStep
 from mobly import asserts