Bump rack from 2.1.2 to 2.2.2 (#13108)
Bumps [rack](https://github.com/rack/rack) from 2.1.2 to 2.2.2.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/2.1.2...v2.2.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>