[CI] fix fa178f3 - test_thread_pool.rb - don't work on 3 branches at once
[CI] fix fa178f3 - test_thread_pool.rb - don't work on 3 branches at once

eileencodes/puma,puma/puma,puma/puma,eileencodes/puma,puma/puma,puma/puma,eileencodes/puma,eileencodes/puma