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

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

I did some bad things in git and so I had to recreate the PR against master, but the importlib.resources tests still fail.

Seems like the ensurepip/venv tests are fine though? Did something change in pip/certifi between 20.2.1 and 20.2.3?

I still consider the changes a release blocking regression, but if it's not blocking ensurepip then I guess the updated packages can go in now. I'll split up my PR tomorrow, but I'm not feeling like fighting git more tonight.

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