Non-universal resolver should ignore requires-python upper bound #5045
Description
Without universal resolution, we fail to resolve colabfold 1.5.5 on python 3.12, since it only supports python 3.9 to 3.11:
$ echo "colabfold==1.5.5" | uv pip compile -p 3.12 -
× No solution found when resolving dependencies:
╰─▶ Because the requested Python version (3.12.0) does not satisfy Python>=3.9,<3.12 and colabfold==1.5.5 depends on
Python>=3.9,<3.12, we can conclude that colabfold==1.5.5 cannot be used.
And because you require colabfold==1.5.5, we can conclude that the requirements are unsatisfiable.
We generally ignore upper version bounds (#4022), the universal resolver also resolves succesfully:
$ echo "colabfold==1.5.5" | uv pip compile -p 3.12 --universal -
Resolved 62 packages in 23ms
[...]
colabfold==1.5.5
[...]
We should change the regular resolver to ignore this requires-python upper bound, too, and make it clear in the docs that we ignore all requires-python upper bounds.