fix transient test failure in protected_branches_access_control_ee

spec/support/shared_examples/features/protected_branches_access_control_ee.rb

@@ -112,7 +112,7 @@ shared_examples "protected branches > access control > EE" do
       wait_for_requests
 
       # Verify the user is appended in the dropdown
-      find(".protected-branches-list .js-allowed-to-#{git_operation}").click
+      find(".protected-branches-list .js-allowed-to-#{git_operation}").trigger(:click)
       expect(page).to have_selector '.dropdown-content .is-active', text: users.last.name
 
       expect(ProtectedBranch.count).to eq(1)