Fix references to Spree::Deprecation

Author: jarednorman

spec/controllers/spree/api/users_controller_spec.rb

@@ -40,7 +40,7 @@
     end
 
     it "updates the subscription line items" do
-      allow(::Spree::Deprecation).to receive(:warn).with(a_string_matching(
+      allow(::Spree.deprecator).to receive(:warn).with(a_string_matching(
         "Creating or updating subscriptions through #{Spree.user_class} nested attributes is deprecated"
       ))
       update_user

spec/decorators/models/solidus_subscriptions/spree/user/have_many_subscriptions_spec.rb

@@ -10,11 +10,11 @@
 
   describe "#subscriptions_attributes=" do
     it "throws a deprecation warning" do
-      allow(::Spree::Deprecation).to receive(:warn)
+      allow(::Spree.deprecator).to receive(:warn)
 
       user.subscriptions_attributes = [{interval_length: 2}]
 
-      expect(::Spree::Deprecation)
+      expect(::Spree.deprecator)
         .to have_received(:warn)
         .with(/Creating or updating subscriptions through #{Spree.user_class} nested attributes is deprecated/)
     end