chore: More restrictive Inspec pin

Author: RulerOf

Gemfile

@@ -5,7 +5,7 @@ gemspec
 group :development do
   # Integration testing gems.
   gem 'kitchen-inspec', '~> 2.0'
-  gem 'inspec', '>= 4.26.2'
+  gem 'inspec', '>= 4.26.2', '< 6.0'
   gem 'train', '>= 2.1', '< 4.0' # validate 4.x when it's released
   # Silence ruby 3.4.0 standard gem deprecation warnings
   gem 'csv', '~> 3.3.0'