Bump parallel from 1.20.1 to 1.21.0 (#16736)

Bump parallel from 1.20.1 to 1.21.0 (#16736)

Bumps [parallel](https://github.com/grosser/parallel) from 1.20.1 to 1.21.0.
- [Release notes](https://github.com/grosser/parallel/releases)
- [Commits](https://github.com/grosser/parallel/compare/v1.20.1...v1.21.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>