[issue46986] Upgrade ensurepip bundled setuptools to 60.9.3

[STINNER Victor]

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

Ned Deily:
> My apologies for not testing running the test suite with installed Pythons as I usually do and thanks, Victor, for noting the buildbot failures.

Well, the change didn't land into a Python release. Right now, the test suite is only run on an installed Python on buildbots.

The regression was noticed early, so it's fine.

Yeah, a revert is better to unblock the releases, to have more time to investigate what's going on.

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