Update accept.txt (#24226)

<!--Delete sections as needed -->


## Description

[Unsloth](https://github.com/unslothai/unsloth), a project designed to
make fine-tuning models much faster and more accessible.

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## Related issues or tickets

<!-- Related issues, pull requests, or Jira tickets -->

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

_vale/config/vocabularies/Docker/accept.txt

@@ -312,3 +312,4 @@ Zsh
 [Rr]erank(ing|ed)?
 [Ee]vals?
 [Ll]abspaces?
+[Uu]nsloth