Bump transformers from 4.19.0 to 4.38.0 in /examples/research_projects/codeparrot (#31285)

Bump transformers in /examples/research_projects/codeparrot

Bumps [transformers](https://github.com/huggingface/transformers) from 4.19.0 to 4.38.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](https://github.com/huggingface/transformers/compare/v4.19.0...v4.38.0

)

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

 datasets==2.3.2
-transformers==4.21.1
+transformers==4.38.0
 wandb==0.13.1
 evaluate==0.2.2
 scikit-learn==1.1.2
\ No newline at end of file

examples/research_projects/codeparrot/requirements.txt

-transformers==4.19.0
+transformers==4.38.0
 datasets==1.16.0
 wandb==0.12.0
 tensorboard==2.6.0