refactor: replace typing_extensions import (#98)

Signed-off-by: Federico Bond <[email protected]>

providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/__init__.py

@@ -1,15 +1,13 @@
 import typing
 
-from typing_extensions import Protocol
-
 from openfeature.evaluation_context import EvaluationContext
 from openfeature.flag_evaluation import FlagResolutionDetails
 
 from .grpc import GrpcResolver
 from .in_process import InProcessResolver
 
 
-class AbstractResolver(Protocol):
+class AbstractResolver(typing.Protocol):
     def shutdown(self) -> None: ...
 
     def resolve_boolean_details(