openvino : fix convert-whisper-to-openvino.py (#1890)

openvino : fix convert-whisper-to-openvino.py (#1890)

Fix issue: Conversion from Whisper to OpenVino failed #1870

convert-whisper-to-openvino.py stopped working with OpenVINO version 2023.0.0-10926-b4452d56304-releases/2023/0 .

Error was: TypeError: load(): incompatible function arguments. The following argument types are supported:
    1. (self: openvino._pyopenvino.FrontEnd, path: object) -> ov::frontend::InputModel

Tested successfully with a large-v3 conversion.

Co-authored-by: Stefan Grundmann <redacted>