Harden Queue#pop timeout tests

They occasionaly fail with;

```
  FLeaked thread: TestThreadQueue#test_queue_pop_timeout: #<Thread:0x0000000108e38e48 /Users/runner/work/ruby/ruby/src/test/ruby/test_thread_queue.rb:123 sleep>
  .Finished thread: TestThreadQueue#test_deny_pushers: #<Thread:0x0000000108e38e48 /Users/runner/work/ruby/ruby/src/test/ruby/test_thread_queue.rb:123 dead>
  ...
  Retrying...

    1) Failure:
  TestThreadQueue#test_sized_queue_pop_timeout [/Users/runner/work/ruby/ruby/src/test/ruby/test_thread_queue.rb:157]:
  <#<Thread:0x00000001084bc7e8 /Users/runner/work/ruby/ruby/src/test/ruby/test_thread_queue.rb:156 sleep>> expected but was
  <nil>.

    2) Failure:
  TestThreadQueue#test_queue_pop_timeout [/Users/runner/work/ruby/ruby/src/test/ruby/test_thread_queue.rb:124]:
  <#<Thread:0x00000001083ff058 /Users/runner/work/ruby/ruby/src/test/ruby/test_thread_queue.rb:123 sleep>> expected but was
  <nil>.
```

I'm hoping joining for longer should help avoid this.

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