Update torch requirement in /_requirements

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](pytorch/pytorch@v1.8.1...v2.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

_requirements/default.txt

@@ -2,6 +2,6 @@ setuptools==67.8.0
 matplotlib>=3.0.0, <3.8.0
 ipython[notebook]>=8.0.0, <8.15.0
 urllib3  # for ipython
-torch>=1.8.1, <2.1.0
+torch>=1.8.1, <2.2.0
 pytorch-lightning>=1.4, <2.1.0
 torchmetrics>=0.7, <0.12