Bump rack from 2.2.4 to 2.2.9 in /omnibus#7

dependabot[bot] wants to merge 1 commit intomainghasctl/inspec:mainfrom

dependabot/bundler/omnibus/rack-2.2.9ghasctl/inspec:dependabot/bundler/omnibus/rack-2.2.9Copy head branch name to clipboard