`add_dll_directory` does not always find the correct ROCm binary on some systems

[winstxnhdw]

Ever since #1989 was merged, all my CI pipelines have been failing.

    from ctranslate2.converters import TransformersConverter
.venv\Lib\site-packages\ctranslate2\__init__.py:24: in <module>
    add_dll_directory(f"{package_dir}/../_rocm_sdk_core/bin")
<frozen os>:1165: in add_dll_directory
    ???
E   FileNotFoundError: [WinError 3] The system cannot find the path specified: 'D:\\a\\ct2hf\\ct2hf\\.venv\\Lib\\site-packages\\ctranslate2/../_rocm_sdk_core/bin'

[jordimas]

Hello @sssshhhhhh if you can look at this please
I also saw #2005 which was closed.