CI: Test with Ruby 4.0 #83
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With Ruby 4, irb is no longer a default gem. Since YARD has code that `require`s irb, for now we need to add this dependency ourselves. We can revert this commit when lsegal/yard#1636 is resolved.
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Ruby 4.0 has been released: https://www.ruby-lang.org/en/news/2025/12/25/ruby-4-0-0-released/
Since in Ruby 4
irbis no longer a default gem, and YARD has code thatrequires irb, for now we need to addirbto our Gemfile. We can revert this commit when lsegal/yard#1636 is resolved.