Fix f-string to show `ACCELERATE_MIN_VERSION` on error
Author: KSafran
Pull request: yes

# Fix f-string to show `ACCELERATE_MIN_VERSION` on error

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If `accelerate` is not installed a helpful warning message shows the `ACCELERATE_MIN_VERSION` required - but the f-string was missing so the package version wasn't displayed. This minor PR fixes that.


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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- [ ] Did you write any new necessary tests?

Minor typo, no new tests.

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Comments:
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