Bump transformers from 4.37.2 to 4.38.0 in /sdk/python/kubeflow/trainer (kubeflow/trainer#2055)

Bumps [transformers](https://github.com/huggingface/transformers) from 4.37.2 to 4.38.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.37.2...v4.38.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

python/kubeflow/trainer/requirements.txt

@@ -1,3 +1,3 @@
 peft==0.3.0
 datasets==2.15.0
-transformers==4.37.2
+transformers==4.38.0