build(deps-dev): bump torchvision in /runtimes/mlflow

Bumps [torchvision](https://github.com/pytorch/vision) from 0.19.1 to 0.21.0.
- [Release notes](https://github.com/pytorch/vision/releases)
- [Commits](pytorch/vision@v0.19.1...v0.21.0)

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

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

Author: dependabot[bot]