[issue42671] Make the Python finalization more deterministic

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> I wrote this issue to attempt to fix a leak in PR 23811 which converts the _thread extension module to the multiphase initialization API (PEP 489).

I fixed this bug by adding a traverse function to the _thread lock type. So I don't *need* this issue to unblock PR 23811 anymore.

But I'm still interested to make the finalization more determistic.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42671>
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