PrepareCommitMsg concurrency spec fails on Ruby 3.2 due to deadlock #838

Overcommit::Hook::PrepareCommitMsg::Base when multiple hooks run simultaneously works well with concurrency
     Failure/Error: Thread.list.each { |t| t.join unless t == Thread.current }

     fatal:
       No live threads left. Deadlock?
       2 threads, 2 sleeps current:0x000055a887475180 main thread:0x000055a8851f0120
       * #<Thread:0x00007f502c89a7c8 sleep_forever>
          rb_thread_t:0x000055a8851f0120 native:0x00007f502d01bc00 int:0
          
       * #<Thread:0x00007f502780aa10@Timeout stdlib thread /opt/hostedtoolcache/Ruby/3.2.3/x64/lib/ruby/3.2.0/timeout.rb:101 sleep_forever>
          rb_thread_t:0x000055a887475180 native:0x00007f502694f640 int:0
           depended by: tb_thread_id:0x000055a8851f0120
          
     # ./spec/overcommit/hook/prepare_commit_msg/base_spec.rb:43:in `join'
     # ./spec/overcommit/hook/prepare_commit_msg/base_spec.rb:43:in `block (4 levels) in <top (required)>'
     # ./spec/overcommit/hook/prepare_commit_msg/base_spec.rb:43:in `each'
     # ./spec/overcommit/hook/prepare_commit_msg/base_spec.rb:43:in `block (3 levels) in <top (required)>'
     # ./spec/spec_helper.rb:64:in `block (3 levels) in <top (required)>'
     # ./lib/overcommit/utils.rb:260:in `with_environment'
     # ./spec/spec_helper.rb:63:in `block (2 levels) in <top (required)>'