Test against Ruby 3.4

[tagliala]

• Nokogiri 1.18 to use binaries
• Ruby 3.4.1 on GitHub actions Add ruby-3.4.0,ruby-3.4.1 ruby/setup-ruby#679
• Ruby edge to move to 3.5.0.dev (this library is not interested by this change)
• Issue with the newly introduced fail_level? reviewdog/action-actionlint#149

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.33%. Comparing base (e6476d8) to head (a67f93d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #647      +/-   ##
==========================================
+ Coverage   94.31%   94.33%   +0.02%     
==========================================
  Files          17       17              
  Lines         457      459       +2     
==========================================
+ Hits          431      433       +2     
  Misses         26       26              

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[javierjulio]

Thanks!