Import PackageName from uv-normalize (#15439)

## Summary

This might be unintentional? `PackageName` is re-exported from
`uv-pep508`, so some crates import it from there.

crates/uv-cli/src/version.rs

@@ -3,7 +3,9 @@
 use std::fmt;
 
 use serde::Serialize;
-use uv_pep508::{PackageName, uv_pep440::Version};
+
+use uv_normalize::PackageName;
+use uv_pep508::uv_pep440::Version;
 
 /// Information about the git repository where uv was built from.
 #[derive(Serialize)]