Bug: Verify is missing from the __init__

[mbotkin]

The verify method is getting masked when some cached_properties were added in version 5.4.0. the properties, like shown below, pushed the self.verify definition out of the init function. This causes webhook validation to fail.

src/retell/_client.py

 @cached_property
    def with_streaming_response(self) -> RetellWithStreamedResponse:
        return RetellWithStreamedResponse(self)

        self.verify = verify  # type: ignore