Force passwordstate to be required

Trying to figure out why tests are broken in CI

test/test_plugin_helper.rb

@@ -15,6 +15,7 @@ end
 
 # This calls the main test_helper in Foreman-core
 require 'test_helper'
+require 'passwordstate'
 
 # Add plugin to FactoryBot's paths
 FactoryBot.definition_file_paths << File.join(__dir__, 'factories')