[3.13] gh-117657: Fix data races reported by TSAN on interp->threads.main (GH-118865) - #118904

[3.13] gh-117657: Fix data races reported by TSAN on interp->threads.main (GH-118865)#118904

colesbury merged 1 commit into

python:3.13python/cpython:3.13from

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