build: bump minitest from 5.12.0 to 5.12.2 in /docs
build: bump minitest from 5.12.0 to 5.12.2 in /docs

Bumps [minitest](https://github.com/seattlerb/minitest) from 5.12.0 to 5.12.2.
- [Release notes](https://github.com/seattlerb/minitest/releases)
- [Changelog](https://github.com/seattlerb/minitest/blob/master/History.rdoc)
- [Commits](https://github.com/seattlerb/minitest/commits)

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