Bump rack from 2.0.7 to 2.2.3 in /examples#9

dependabot[bot] wants to merge 1 commit intomasterakicho8/tree_support:masterfrom

dependabot/bundler/examples/rack-2.2.3akicho8/tree_support:dependabot/bundler/examples/rack-2.2.3Copy head branch name to clipboard