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gh-151218: Replace sys.flags in PyConfig_Set() (GH-151402)
PyConfig_Set() and sys.set_int_max_str_digits() now replace
sys.flags (create a new object), instead of modifying sys.flags in-place.
Modifying sys.flags in-place can lead to data races when multiple
threads are reading or writing sys.flags in parallel.
Use _Py_atomic functions to get and set max_str_digits members.
(cherry picked from commit b16d23fc9f)
Co-authored-by: Victor Stinner <[email protected]>
Co-authored-by: Bénédikt Tran <[email protected]>