Bump taskgroup from 7.19.0 to 7.20.0

Bumps [taskgroup](https://github.com/bevry/taskgroup) from 7.19.0 to 7.20.0.
- [Changelog](https://github.com/bevry/taskgroup/blob/master/HISTORY.md)
- [Commits](bevry/taskgroup@v7.19.0...v7.20.0)

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

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