fix: add response object to address failures relating to @Actual parameter

Author: nzlaura

lib/rubocop/cop/rspec_rails/minitest_assertions.rb

@@ -323,15 +323,16 @@ class ResponseAssertion < BasicAssertion
 
           # @!method self.minitest_assertion(node)
           def_node_matcher 'self.minitest_assertion', <<~PATTERN # rubocop:disable InternalAffairs/NodeMatcherDirective
-            (send nil? :assert_response $_ $_?)
+            (send nil? {:assert_response} $_ $_?)
           PATTERN
 
           def self.match(expected, failure_message)
-            new(expected, nil, failure_message.first)
+            response = Struct.new(:source).new('response')
+            new(expected, response, failure_message.first)
           end
 
           def assertion
-            "have_http_status(#{expected.source})"
+            "have_http_status(#{expected})"
           end
         end