Bump torch from 1.12.1 to 2.8.0 in /demo/alti/detecting_hallucinations (#78)

Bumps [torch](https://github.com/pytorch/pytorch) from 1.12.1 to 2.8.0.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](pytorch/pytorch@v1.12.1...v2.8.0)

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

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Author: dependabot[bot]

demo/alti/detecting_hallucinations/requirements.txt

@@ -1,6 +1,6 @@
 # install stopes with its ALTI dependencies: cd stopes && pip install -e '.[alti]'
 # !pip install unbabel-comet==1.1.2 --use-feature=2020-resolver
-torch==1.12.1
+torch==2.8.0
 unbabel-comet==1.1.3
 sentence-transformers==2.2.2
 transformers==4.22.0