fix flaky update_many test

Author: nogates

spec/live/user_spec.rb

@@ -127,7 +127,9 @@ def valid_attributes
 
  before do
  VCR.use_cassette("update_many_users") do
- ZendeskAPI::User.update_many!(client, created_user_ids, notes: "this is a note")
+ ZendeskAPI::User.update_many!(client, created_user_ids, notes: "this is a note").tap do |job|
+ job.reload! while job.status != "completed"
+ end
  end
  end