Update epubcheck-ruby requirement from 5.1.0.0 to 5.2.0.0#2006

ben merged 1 commit intomainprogit/progit2:mainfrom

dependabot/bundler/epubcheck-ruby-5.2.0.0progit/progit2:dependabot/bundler/epubcheck-ruby-5.2.0.0Copy head branch name to clipboard