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83b0cabc - Trac #34849: More fixes to support tox 4

Trac #34849: More fixes to support tox 4 The tox.ini files in pkgs/*/ are broken with tox 4. Early versions of tox 4.x have additional defects. - https://github.com/tox- dev/tox/discussions/2699#discussioncomment-4403536 - factors no longer work in `passenv` - fixed in tox 4.0.13 - negated factors in `deps`, like `!pipenv-!norequirements: -rrequirements.txt` do not work - https://github.com/tox- dev/tox/issues/2747 - fixed in tox 4.0.15 - And autoprovisioning for downgrade to tox 3 is not working - https://github.com/tox-dev/tox/issues/2634 - In SAGE_ROOT/tox.ini, in tox 4 earlier than 4.2.7, numerical factors are broken because they are misinterpreted as Python versions (https://tox.wiki/en/latest/changelog.html#bugfixes-4-2-7); e.g., 4.0.14 is broken: {{{ tox -e docker-linuxmint-21.1-standard git:t/34903/tox_ini___gh_actions__update_linux_platforms* docker-linuxmint-21.1-standard: skipped because could not find python interpreter with spec(s): 21.1 docker-linuxmint-21.1-standard: SKIP (1.98 seconds) }}} Here we update affected `tox.ini` files so that: - src/tox.ini and pkgs/*/tox.ini work both with suitable versions of tox 3 and tox 4. We change the tox `spkg-configure.m4` to check for such versions. - SAGE_ROOT/tox.ini work with tox >= 4.2.7 (autoprovisioning if necessary) Follow up: - #34840 Upgrade tox to 4.x URL: https://trac.sagemath.org/34849 Reported by: mkoeppe Ticket author(s): Matthias Koeppe Reviewer(s): Dima Pasechnik