Disable Ruby 3.4 testing

puppet-lint isn't compatible yet with Ruby 3.4
puppetlabs/puppet-lint#231

Author: bastelfreak

puppet-lint-exec_idempotency-check.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
     A puppet-lint plugin to check the idempotency attributes on exec resources.
   END_DESC
 
-  spec.required_ruby_version = '>= 2.7.0'
+  spec.required_ruby_version = '>= 2.7.0', '< 3.4'
 
   spec.add_dependency 'puppet-lint', '>= 3', '< 5'
   spec.add_development_dependency 'mime-types', '~> 3.4', '>= 3.4.1'