Update accept.txt (#24226)

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## 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

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## Reviews

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

Author: ajeetraina

_vale/config/vocabularies/Docker/accept.txt

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