[3.13] gh-120973: Fix thread-safety issues with threading.local
(GH-121655)
#122042
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This is a small refactoring to the current design that allows us to
avoid manually iterating over threads.
This should also fix gh-118490.
(cherry picked from commit e059aa6)
Co-authored-by: mpage mpage@meta.com
threading.local()
implementation is not thread-safe in the free-threaded build #120973