Pin pip to 20.x (the last version to support Python 2) #51
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I'm not 100% sure this is the "right" solution, but we have the very real situation where pip 21.x has been released which drops Python 2 support, but PyPy is still actively supporting their Python 2 variant (for the foreseeable future), and IMO it would be strange for us to ship pip 21.x for
pypy:3
and pip 20.x forpypy:2
when they're actually part of the same PyPy release (not separate release lines, like in upstream Python).