Fix typo at ImportError

[DrAnaximandre]

What does this PR do?

When instantiating a QuantoHfQuantizer, the ImportError message that is risen for accelerate has a typo in it.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).

Who can review?

Anyone in the community is free to review the PR once the tests have passed.

[amyeroberts]

Thanks for fixing this!

The failing errors are unrelated to this PR. Once a fix is merged into main, we'll let you know, you can rebase and then we can merge this in

[amyeroberts]

Merging as the fix was merged into main, and the change here is unrelated, so no need to run CI again