Bump torch from 2.7.0 to 2.9.1

Bumps [torch](https://github.com/pytorch/pytorch) from 2.7.0 to 2.9.1.
- [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...v2.9.1)

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -14,7 +14,7 @@ Flask==3.1.1
 clean-text==0.6.0
 unidecode==1.4.0
 spacy==3.8.11
-torch==2.7.0
+torch==2.9.1
 transformers==4.52.4
 ffmpeg-python==0.2.0
 elevenlabs==1.57.0