Bump torch from 1.8.1 to 1.9.0

Bumps [torch](https://github.com/pytorch/pytorch) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/master/RELEASE.md)
- [Commits](pytorch/pytorch@v1.8.1...v1.9.0)

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

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

Author: dependabot[bot]

requirements-test.txt

@@ -7,5 +7,5 @@ pytest
 pytorch-lightning==1.4.1
 lightning-bolts==0.3.3
 ray[tune]
-torch==1.8.1
+torch==1.9.0
 torchvision