On Windows machines with >= 32 cores (more than 64 logical processors) execution fails

[ssproessig]

Shown as

(venv) my_dir>bump-pydantic --version      
bump-pydantic version: 0.7.0

(venv) my_dir>bump-pydantic .         
[13:44:38] Start bump-pydantic.                                                                                                                                                                                                                                                                                                                                        main.py:61
           Found 10 files to process                                                                                                                                                                                                                                                                                                                                   main.py:76
Exception in thread Thread-3 (_handle_workers):
Traceback (most recent call last):
  File "C:\_\py311\Lib\threading.py", line 1038, in _bootstrap_inner
    self.run()
  File "C:\_\py311\Lib\threading.py", line 975, in run
    self._target(*self._args, **self._kwargs)
  File "C:\_\py311\Lib\multiprocessing\pool.py", line 522, in _handle_workers
    cls._wait_for_updates(current_sentinels, change_notifier)
  File "C:\_\py311\Lib\multiprocessing\pool.py", line 502, in _wait_for_updates
    wait(sentinels, timeout=timeout)
  File "C:\_\py311\Lib\multiprocessing\connection.py", line 878, in wait
    ready_handles = _exhaustive_wait(waithandle_to_obj.keys(), timeout)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\_\py311\Lib\multiprocessing\connection.py", line 810, in _exhaustive_wait
    res = _winapi.WaitForMultipleObjects(L, False, timeout)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: need at most 63 handles, got a sequence of length 66
Executing codemods... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╺━━━━━━━  80% 0:00:01Process SpawnPoolWorker-64:

Afterwards it freezes without any processing. Even Ctrl+C doesn't work.

Googling for it suggests that this is a common problem with multiprocessing on Windows.

[Kludex]

• This is the issue: multiprocessing.Pool(64) throws on Windows python/cpython#89240