build(deps): update torch requirement from ~=2.7.0 to ~=2.8.0

Updates the requirements on [torch](https://github.com/pytorch/pytorch) to permit the latest version.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](https://github.com/pytorch/pytorch/compare/v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.8.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -8,7 +8,7 @@ torch~=2.8.0
 sentencepiece~=0.2.0
 setuptools~=80.7.1
 huggingface-hub~=0.33.1
-transformers~=4.56.1
+transformers~=4.51.3
 fastapi~=0.115.12
 uvicorn~=0.34.2
 certifi~=2025.4.26