Bump parallel from 1.12.1 to 1.13.0 in /docs
Bump parallel from 1.12.1 to 1.13.0 in /docs

Bumps [parallel](https://github.com/grosser/parallel) from 1.12.1 to 1.13.0.
- [Release notes](https://github.com/grosser/parallel/releases)
- [Commits](https://github.com/grosser/parallel/compare/v1.12.1...v1.13.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Linuxbrew/brew,nandub/brew,reitermarkus/brew,EricFromCanada/brew,reitermarkus/brew,konqui/brew,EricFromCanada/brew,konqui/brew,sjackman/homebrew,EricFromCanada/brew,Linuxbrew/brew,MikeMcQuaid/brew,mahori/brew,JCount/brew,JCount/brew,EricFromCanada/brew,vitorgalvao/brew,nandub/brew,sjackman/homebrew,Homebrew/brew,nandub/brew,vitorgalvao/brew,reitermarkus/brew,mahori/brew,vitorgalvao/brew,sjackman/homebrew,MikeMcQuaid/brew,Homebrew/brew,konqui/brew,mahori/brew,Linuxbrew/brew,JCount/brew,claui/brew,Linuxbrew/brew,Homebrew/brew,sjackman/homebrew,mahori/brew,vitorgalvao/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,reitermarkus/brew,claui/brew,JCount/brew,konqui/brew,Homebrew/brew,nandub/brew,claui/brew,claui/brew