Build(deps): bump transformers from 4.31.0 to 4.38.0 in /forge

Bumps [transformers](https://github.com/huggingface/transformers) from 4.31.0 to 4.38.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.31.0...v4.38.0)

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

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

forge/requirements.txt

@@ -128,7 +128,7 @@ torch==2.0.1
 tornado==6.3.3
 tqdm==4.66.1
 traitlets==5.9.0
-transformers==4.31.0
+transformers==4.38.0
 typing_extensions==4.7.1
 tzdata==2023.3
 uri-template==1.3.0