ruff

ed4a0b34 - [red-knot] don't include Unknown in the type for a conditionally-defined import (#13563)

[red-knot] don't include Unknown in the type for a conditionally-defined import (#13563) ## Summary Fixes the bug described in #13514 where an unbound public type defaulted to the type or `Unknown`, whereas it should only be the type if unbound. ## Test Plan Added a new test case --------- Co-authored-by: Carl Meyer <carl@astral.sh>