source_files.update_file is not accepting 'importTranslations': True

I'm using the method `source_files.update_file` with a custom importOptions object.

I inputted `'importTranslations': True`, but the API is returning `'importTranslations': False`

See the screenshot below.

On the other side, for the `source_files.add_file` method, it works correctly.

I need `source_files.update_file` to accept '`importTranslations': True`

Start by comparing the source_files.update_file and source_files.add_file implementations, focusing on how each handles the custom importOptions object and importTranslations value. Confirm the behavior with the existing tests or API client test setup; done means update_file sends and preserves importTranslations=True as add_file does.

Written by the indexing model from the issue text.