Update activemerchant gem

Fixes #6241

core/spec/models/spree/payment_spec.rb

@@ -521,7 +521,9 @@
 
       context "when there is an error connecting to the gateway" do
         it "should call gateway_error " do
-          expect(gateway).to receive(:create_profile).and_raise(ActiveMerchant::ConnectionError)
+          message = double("gateway_error")
+          connection_error = ActiveMerchant::ConnectionError.new(message, nil)
+          expect(gateway).to receive(:create_profile).and_raise(connection_error)
           expect do
             Spree::Payment.create(
               :amount => 100,

core/spec/models/spree/refund_spec.rb

@@ -141,10 +141,13 @@
 
     context 'with an activemerchant gateway connection error' do
       before do
-        expect(payment.payment_method)
-          .to receive(:credit)
-          .with(amount_in_cents, payment.source, payment.transaction_id, {originator: an_instance_of(Spree::Refund)})
-          .and_raise(ActiveMerchant::ConnectionError)
+        message = double("gateway_error")
+        expect(payment.payment_method).to receive(:credit).with(
+          amount_in_cents,
+          payment.source,
+          payment.transaction_id,
+          originator: an_instance_of(Spree::Refund)
+        ).and_raise(ActiveMerchant::ConnectionError.new(message, nil))
       end
 
       it 'raises Spree::Core::GatewayError' do

core/spree_core.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.files        = Dir['LICENSE', 'README.md', 'app/**/*', 'config/**/*', 'lib/**/*', 'db/**/*', 'vendor/**/*']
   s.require_path = 'lib'
 
-  s.add_dependency 'activemerchant', '~> 1.46.0'
+  s.add_dependency 'activemerchant', '~> 1.47.0'
   s.add_dependency 'acts_as_list', '~> 0.6'
   s.add_dependency 'awesome_nested_set', '~> 3.0.1'
   s.add_dependency 'carmen', '~> 1.0.0'