Remove deprecated usage of alias_attributes

This commit removes the following deprecations:

DEPRECATION WARNING: Spree::Order model aliases `bill_address`, but `bill_address` is not an attribute. Starting in Rails 7.2, alias_attribute with non-attribute targets will raise. Use `alias_method :billing_address, :bill_address` or define the method manually.

DEPRECATION WARNING: Spree::Order model aliases `ship_address`, but `ship_address` is not an attribute. Starting in Rails 7.2, alias_attribute with non-attribute targets will raise. Use `alias_method :shipping_address, :ship_address` or define the method manually.

DEPRECATION WARNING: Spree::CreditCard model aliases `cc_type` and has a method called `cc_type=` defined. Starting in Rails 7.2 `brand=` will not be calling `cc_type=` anymore. You may want to additionally define `brand=` to preserve the current behavior.

core/app/models/spree/credit_card.rb

@@ -95,6 +95,10 @@ def cc_type=(type)
       end
     end
 
+    def brand=(type)
+      cc_type = type
+    end
+
     # Sets the last digits field based on the assigned credit card number.
     def set_last_digits
       self.last_digits ||= number.to_s.length <= 4 ? number : number.to_s.slice(-4..)

core/app/models/spree/order.rb

@@ -73,10 +73,9 @@ class CannotRebuildShipments < StandardError; end
     # Customer info
     belongs_to :user, class_name: Spree::UserClassHandle.new, optional: true
     belongs_to :bill_address, foreign_key: :bill_address_id, class_name: 'Spree::Address', optional: true
-    alias_attribute :billing_address, :bill_address
-
+    alias_method :billing_address, :bill_address
     belongs_to :ship_address, foreign_key: :ship_address_id, class_name: 'Spree::Address', optional: true
-    alias_attribute :shipping_address, :ship_address
+    alias_method :billing_address, :bill_address
     alias_attribute :ship_total, :shipment_total
 
     belongs_to :store, class_name: 'Spree::Store', optional: true