Bump transformers from 4.36.2 to 4.38.0 in /docs

Bumps [transformers](https://github.com/huggingface/transformers) from 4.36.2 to 4.38.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.36.2...v4.38.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -8,7 +8,7 @@ sentencepiece==0.1.99
 tokenizers==0.15.0
 torch==2.1.1
 tqdm==4.66.1
-transformers==4.36.2
+transformers==4.38.0
 Sphinx==7.1.2
 sphinx-autodoc-typehints==1.25.2
 sphinx-markdown-builder==0.6.5