Use :create instead of :build in order updater specs

The order updater requires a persisted order

engines/order_management/spec/services/order_management/order/updater_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 module OrderManagement
   module Order
     describe Updater do
-      let(:order) { build(:order) }
+      let(:order) { create(:order) }
       let(:updater) { OrderManagement::Order::Updater.new(order) }
 
       before { allow(order).to receive(:backordered?) { false } }

spec/models/spree/order/updating_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 describe Spree::Order do
-  let(:order) { build(:order) }
+  let(:order) { create(:order) }
 
   context "#update!" do
     let(:line_items) { [build(:line_item, amount: 5)] }