[issue46986] Upgrade ensurepip bundled setuptools to 60.9.3

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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pull_requests: +29979
pull_request: https://github.com/python/cpython/pull/31881

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46986>
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