Bump torch from 1.13.1 to 2.2.0 in /docs

Bumps [torch](https://github.com/pytorch/pytorch) from 1.13.1 to 2.2.0.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](pytorch/pytorch@v1.13.1...v2.2.0)

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

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

docs/requirements.txt

@@ -1,2 +1,2 @@
 sphinxcontrib-bibtex
-torch==1.13.1
+torch==2.2.0