build(deps): bump transformers in /requirements/extras

Bumps [transformers](https://github.com/huggingface/transformers) from 4.48.0 to 4.50.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.48.0...v4.50.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-version: 4.50.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/extras/test_requirements.txt

@@ -33,7 +33,7 @@ pillow>=10.0.1,<=11
 opentelemetry-proto==1.27.0
 protobuf==4.25.5
 tensorboard>=2.16.2,<=2.18.0
-transformers==4.48.0
+transformers==4.50.0
 sentencepiece==0.1.99
 # https://github.com/triton-inference-server/server/issues/6246
 tritonclient[http]<2.37.0