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PyList_SetItem missing atomic store #129643

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@kumaraditya303

Bug report

PyList_SetItem currently uses Py_XSETREF to set the item and decref the old one, however the store is not atomic as such it can race with a concurrent read. The fix is to use a atomic store with release order to correctly set the new item and then decref the old object.

cc @colesbury @Yhg1s

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