Revert "Mitigate Python 3.12 Shutdown RuntimeError"

[ppigazzini]

Reverts #1925

PROD updated to python 3.12.3 that has the bugfix python/cpython#117029

# test_interpreter_shutdown.py
import threading, time

def main():
    threading.Thread(target=bloop).start()

def bloop():
    time.sleep(0.5)
    threading.Thread(target=print, args=("new thread running",)).start()

main()

• python 3.12.3:

$ python3 test_interpreter_shutdown.py
new thread running

• python 3.12.2:

$ python3 test_interpreter_shutdown.py
Exception in thread Thread-1 (bloop):
Traceback (most recent call last):
  File "/home/fishtest/.pyenv/versions/3.12.2/lib/python3.12/threading.py", line 1073, in _bootstrap_inner
    self.run()
  File "/home/fishtest/.pyenv/versions/3.12.2/lib/python3.12/threading.py", line 1010, in run
    self._target(*self._args, **self._kwargs)
  File "/home/fishtest/test_interpreter_shutdown.py", line 8, in bloop
    threading.Thread(target=print, args=("new thread running",)).start()
  File "/home/fishtest/.pyenv/versions/3.12.2/lib/python3.12/threading.py", line 992, in start
    _start_new_thread(self._bootstrap, ())
RuntimeError: can't create new thread at interpreter shutdown