[issue41490] Update bundled pip to 20.2.1 and setuptools to 49.2.1

[Steve Dower]

Change by Steve Dower <steve.dower at python.org>:


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keywords: +patch
pull_requests: +20892
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/21748

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<https://bugs.python.org/issue41490>
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