Try to fix our Azure + MacOS test woes

[pradyunsg]

No description provided.

[pradyunsg]

ModuleNotFoundError: No module named 'pip._internal.utils'

Uh... what?

https://dev.azure.com/pypa/pip/_build/results?buildId=29591&view=logs&j=88d9dc86-3d79-5e8a-7a2d-b92d46a16d40&t=6bf4b43e-ad63-576f-33cc-d8124dfcf590&l=178

[pradyunsg]

Paul Moore: I think I might have commit on scripttest, so if you have a PR that handles this, then I'm OK to merge it. But we'd have to pull from git, as I don't know how to do a release. (Hmm, actually you did the last commit on scripttest, so I think you do have commit privs!)

Paul Moore: I actually checked, and all pip committers have admin access to the scripttest repo...

Yay! Let's figure out what the fix can be, over on scripttest's repo.

[pradyunsg]

Oh look, I broke more stuff.

[pradyunsg]

Third time's the charm?

[pradyunsg]

Nope.

[pradyunsg]

#9030 has context on the different approach taken.