Let's say OpenAI did actually use Scarlett Johansson's voice. Who owns the audio that OpenAI used? Scarlett Johansson herself or the movie company that used the audio in their movie(s)? This might be a case of Scarlett Johansson vs the movie company, not Scarlett Johansson vs OpenAI, as OpenAI could have paid for them.
If she signed away her likeness rights then probably. However if the contract didn't have a provision for transfer to another medium then they would revert to her.