Properly apply constraints in venv audit (#1956)

## Summary

We were applying every constraint to every dependency. This is
"harmless" in practice since this is just an optimization, but we thus
had false negatives ~every time which could lead to wasted work.

crates/uv-installer/src/site_packages.rs

@@ -334,6 +334,10 @@ impl<'a> SitePackages<'a> {
 
                     // Validate that the installed version satisfies the constraints.
                     for constraint in constraints {
+                        if constraint.name != requirement.name {
+                            continue;
+                        }
+
                         if !constraint.evaluate_markers(self.venv.interpreter().markers(), &[]) {
                             continue;
                         }