Revert "Disable litmus when Ruby 3"

This reverts commit 57e6de9985.

Reason for revert:
The new bolt 3.23.0, which is compatible with Ruby 3,  was released.

Change-Id: I306110131000cc29b58e0c2a8f17037286b8004b

lib/puppet-openstack_spec_helper/rake_tasks.rb

@@ -3,11 +3,7 @@ require 'puppetlabs_spec_helper/rake_tasks'
 require 'puppet-lint/tasks/puppet-lint'
 require 'puppet-syntax/tasks/puppet-syntax'
 require 'metadata-json-lint/rake_task'
-begin
-  require 'puppet_litmus/rake_tasks'
-rescue LoadError
-  # In case puppet_litmus does not support the OS (eg. CentOS Stream 9)
-end
+require 'puppet_litmus/rake_tasks'
 require 'json'
 
 modname = JSON.parse(open('metadata.json').read)['name'].split('-')[1]

puppet-openstack_spec_helper.gemspec

@@ -50,13 +50,7 @@ Gem::Specification.new do |spec|
     spec.add_dependency 'pathspec', ['< 1.0.0']
   end
 
-  # NOTE(tkajinam): The latest bolt does not support Ruby 3 yet. Disable litmus
-  #                 so that we can run unit tests in CentOS Stream 9 which has
-  #                 Ruby 3.
-  if RUBY_VERSION < '3.0.0'
-    spec.add_dependency 'bolt'
-    spec.add_dependency 'puppet_litmus', ['0.33.2']
-  end
-
+  spec.add_dependency 'bolt'
+  spec.add_dependency 'puppet_litmus'
   spec.add_dependency 'serverspec'
 end