Bump parallel from 1.28.0 to 2.1.0 in /updater

Bumps [parallel](https://github.com/grosser/parallel) from 1.28.0 to 2.1.0.
- [Changelog](https://github.com/grosser/parallel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/grosser/parallel/compare/v1.28.0...v2.1.0)

---
updated-dependencies:
- dependency-name: parallel
  dependency-version: 2.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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