Bump transformers from 4.50.0 to 4.51.0 in /examples/bitnet-1.58b (#615)

Bumps [transformers](https://github.com/huggingface/transformers) from 4.50.0 to 4.51.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](https://github.com/huggingface/transformers/compare/v4.50.0...v4.51.0

)

---
updated-dependencies:
- dependency-name: transformers
  dependency-version: 4.51.0
  dependency-type: direct:production
...
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examples/bitnet-1.58b/requirements.txt

 lm_eval==0.3.0
 flash_attn
-transformers==4.50.0
\ No newline at end of file
+transformers==4.51.0
\ No newline at end of file