build: bump parallel from 1.17.0 to 1.18.0 in /Library/Homebrew

Bumps [parallel](https://github.com/grosser/parallel) from 1.17.0 to 1.18.0.
- [Release notes](https://github.com/grosser/parallel/releases)
- [Commits](https://github.com/grosser/parallel/compare/v1.17.0...v1.18.0

)

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