Avoid preferring constrained over unconstrained packages #3148
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Summary
pip prefers somewhat-constrained over unconstrained packages... but only if they're at equal depths in the tree. We don't have a way to track the latter property yet (I've added a TODO), so for now, we should remove this constraint -- it seems to be counter-productive.
I've filed #3149 as a follow-up.
Closes #3143
Test Plan
git clone https://github.com/drivendataorg/zamba.git
cat "-e .[tests]" > req.in
cargo run venv && cargo run pip compile req.in --refresh -n --python-platform linux --python-version 3.8