Fix RSpec/VerifiedDoubles cop (#25469)

spec/workers/publish_scheduled_announcement_worker_spec.rb

@@ -12,7 +12,7 @@ describe PublishScheduledAnnouncementWorker do
 
   describe 'perform' do
     before do
-      service = double
+      service = instance_double(FetchRemoteStatusService)
       allow(FetchRemoteStatusService).to receive(:new).and_return(service)
       allow(service).to receive(:call).with('https://domain.com/users/foo/12345') { remote_status.reload }