Bump rack from 2.2.3 to 2.2.6.2 in /blog#13

dependabot[bot] wants to merge 1 commit intomasterTweedChristian/rails-demo:masterfrom

dependabot/bundler/blog/rack-2.2.6.2TweedChristian/rails-demo:dependabot/bundler/blog/rack-2.2.6.2Copy head branch name to clipboard