(CONT-237) - Set minimum puppet version to 6.0

Author: chelnak

puppetlabs_spec_helper.gemspec

@@ -26,12 +26,14 @@ Gem::Specification.new do |spec|
   spec.executables = Dir['bin/**/*'].map { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = Gem::Requirement.new('>= 2.7'.freeze)
+  spec.required_ruby_version = Gem::Requirement.new('>= 2.7')
 
   spec.add_runtime_dependency 'mocha', '~> 1.0'
   spec.add_runtime_dependency 'pathspec', '~> 1.0'
   spec.add_runtime_dependency 'puppet-lint', '~> 3.0'
   spec.add_runtime_dependency 'puppet-syntax', '~> 3.0'
   spec.add_runtime_dependency 'rspec-github', '~> 2.0'
   spec.add_runtime_dependency 'rspec-puppet', '~> 2.0'
+
+  spec.requirements << 'puppet, >= 6.0.0'
 end