Fix flakey time-sensitive remove deploy key spec

spec/features/projects/deploy_keys_spec.rb

@@ -22,7 +22,8 @@ describe 'Project deploy keys', :js do
 
         accept_confirm { find('.ic-remove').click() }
 
-        expect(page).not_to have_selector('.fa-spinner', count: 0)
+        wait_for_requests
+
         expect(page).to have_selector('.deploy-key', count: 0)
       end
     end