Bump vello from 0.1.0 to 0.2.0

Bumps [vello](https://github.com/linebender/vello) from 0.1.0 to 0.2.0.
- [Release notes](https://github.com/linebender/vello/releases)
- [Changelog](https://github.com/linebender/vello/blob/main/CHANGELOG.md)
- [Commits](linebender/vello@v0.1.0...v0.2.0)

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

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