Bump transformers from 3.5.1 to 4.38.0 in /examples/research_projects/adversarial (#31320)

Bump transformers in /examples/research_projects/adversarial

Bumps [transformers](https://github.com/huggingface/transformers) from 3.5.1 to 4.38.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](https://github.com/huggingface/transformers/compare/v3.5.1...v4.38.0

)

---
updated-dependencies:
- dependency-name: transformers
  dependency-type: direct:production
...
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examples/research_projects/adversarial/requirements.txt

-transformers == 3.5.1
+transformers == 4.38.0