Temporarily pin virtualenv to 16.7.10 to fix CI failures #10853
Merged
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virtualenv's 16.7.11 release yesterday appears to have broken our CI by updating the embedded version of pip to something that doesn't support python 2 (see #10407 (comment) for more info).
This is probably not an ideal long-term fix seeing as we're eventually going to need to switch to virtualenv 20 for python 3.10 support (see #10407), but this should fix CI long enough to find a better fix for this, whether that means:
Test Plan
I have no clue how to test this on my computer, but hopefully if the CI passes on this that should be enough confirmation that this works.