Upgrade tox to 4.x #34840
Description
Depends on #34839
Component: packages: standard
Branch: u/mkoeppe/upgrade_tox_4
Issue created by migration from https://trac.sagemath.org/ticket/34840
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Depends on #34839
Component: packages: standard
Branch: u/mkoeppe/upgrade_tox_4
Issue created by migration from https://trac.sagemath.org/ticket/34840