Upgrade yard to 0.9.24, CVE and Ruby 2.7 compatible

Yard need Redcarpet upgraded otherwise it can find it

Author: xaviershay

Gemfile

@@ -7,7 +7,7 @@ gemspec
 rspec_dependencies_gemfile = File.expand_path("../Gemfile-rspec-dependencies", __FILE__)
 eval_gemfile rspec_dependencies_gemfile
 
-gem 'yard', '~> 0.8.7', require: false
+gem 'yard', '~> 0.9.24', :require => false
 
 ### deps for rdoc.info
 group :documentation do