Pip 21.1 can't import InvalidSchemeCombination
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At work, we use Github actions to build and test our Pull Requests before they can be approved. On Friday afternoon, everything was working just fine. On Monday morning, all tests were failing pretty early, with an error showing that pip could no longer find its own exceptions. Did something change with the newest Pip? As you can see in the errors below, our own code isn't referenced, and I'm fairly certain nothing in our flow changed between Friday and Monday (we're a small team and the approved PRs don't have anything surprising there). Error Traceback: Traceback (most recent call last): File "/opt/hostedtoolcache/Python/3.7.9/x64/bin/pip", line 5, in <module> from pip._internal.cli.main import main File "/opt/h...