Fix Ruby 2.7 deprecation warnings for RefreshService

In Ruby 3.0, positional arguments and keyword arguments will
be separated. In Ruby 2.7, deprecation warnings related to
keyword arguments show up.

Explicitly specify passing keyword arguments instead of a Hash
object by using double splat operator.

Since `Repository#create_file` expects kwargs, updated the spec
to pass options as keyword arguments.

app/services/merge_requests/refresh_service.rb

@@ -184,7 +184,7 @@ module MergeRequests
 
     def abort_auto_merge_with_todo(merge_request, reason)
       response = abort_auto_merge(merge_request, reason)
-      response = ServiceResponse.new(response)
+      response = ServiceResponse.new(**response)
       return unless response.success?
 
       todo_service.merge_request_became_unmergeable(merge_request)

ee/spec/services/ee/merge_requests/refresh_service_spec.rb

@@ -190,7 +190,7 @@ RSpec.describe MergeRequests::RefreshService do
         end
 
         before do
-          project.repository.create_file(owner, 'CODEOWNERS', file, { branch_name: 'test', message: 'codeowners' })
+          project.repository.create_file(owner, 'CODEOWNERS', file, branch_name: 'test', message: 'codeowners')
 
           subject
         end