Bump parallel from 1.19.2 to 1.20.0 (#15115)

Bumps [parallel](https://github.com/grosser/parallel) from 1.19.2 to 1.20.0.
- [Release notes](https://github.com/grosser/parallel/releases)
- [Commits](https://github.com/grosser/parallel/compare/v1.19.2...v1.20.0

)

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