(PE-42498) try v4 for system tests

Author: davidmalloncares

Gemfile

@@ -43,6 +43,7 @@ group :development do
   gem "orchestrator_client", '< 0.7.1',          require: false
 end
 group :system_tests do
+  gem "bolt", "~> 4.0", require: false
   gem "puppet_litmus", '~> 2.0', require: false, platforms: [:ruby, :x64_mingw]
   gem "serverspec", '~> 2.41',   require: false
 end