[issue46986] Upgrade ensurepip bundled setuptools to 60.9.3

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

My apologies for not testing running the test suite with installed Pythons as I usually do and thanks, Victor, for noting the buildbot failures. I'm reverting these setuptools updates to avoid blocking releases. We can track the issue with setuptools in bpo-47013.

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