build(deps): bump torchvision from 0.20.1 to 0.21.0 in /tests/e2e

Bumps [torchvision](https://github.com/pytorch/vision) from 0.20.1 to 0.21.0.
- [Release notes](https://github.com/pytorch/vision/releases)
- [Commits](pytorch/vision@v0.20.1...v0.21.0)

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

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

Author: dependabot[bot]

tests/e2e/mnist_pip_requirements.txt

@@ -1,4 +1,4 @@
 pytorch_lightning==1.9.5
 torchmetrics==0.9.1
-torchvision==0.20.1
+torchvision==0.21.0
 minio