fix: remove unused import

Signed-off-by: Danju Visvanathan <danju.visvanathan@gmail.com>

Author: danjuv

openfeature/provider/no_op_provider.py

@@ -6,7 +6,6 @@
 from openfeature.flag_evaluation import FlagResolutionDetails, Reason
 from openfeature.provider import AbstractProvider
 from openfeature.provider.no_op_metadata import NoOpMetadata
-from openfeature.track import TrackingEventDetails
 
 if typing.TYPE_CHECKING:
     from openfeature.evaluation_context import EvaluationContext