Bump rack from 2.2.6.4 to 2.2.8.1#9

dependabot[bot] wants to merge 1 commit intomainCraigJZ/sinatra_blackjack:mainfrom

dependabot/bundler/rack-2.2.8.1CraigJZ/sinatra_blackjack:dependabot/bundler/rack-2.2.8.1Copy head branch name to clipboard