Switch to default spec_helper_acceptance file

Author: Daniel Carabas

spec/spec_helper_acceptance.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'serverspec'
 require 'puppet_litmus'
 require 'spec_helper_acceptance_local' if File.file?(File.join(File.dirname(__FILE__), 'spec_helper_acceptance_local.rb'))