Get rid of sleep time requirement

fastlane_core/spec/build_watcher_spec.rb

@@ -111,7 +111,7 @@
     it 'waits when the build disappears' do
       expect(Spaceship::TestFlight::Build).to receive(:all_processing_builds).and_return([processing_build])
       expect(Spaceship::TestFlight::Build).to receive(:builds_for_train).and_return([], [ready_build])
-      expect(FastlaneCore::BuildWatcher).to receive(:sleep).with(10)
+      expect(FastlaneCore::BuildWatcher).to receive(:sleep)
 
       expect(UI).to receive(:message).with("Build doesn't show up in the build list any more, waiting for it to appear again")
       expect(UI).to receive(:success).with("Successfully finished processing the build #{ready_build.train_version} - #{ready_build.build_version}")