Use fs_err for paths in symlinking errors (#13303)

In #13302, there was an IO error without context. This error seems to be
caused by a symlink error. Switching as symlinking to `fs_err` ensures
these errors will carry context in the future.

crates/uv-python/src/downloads.rs

@@ -761,7 +761,7 @@ impl ManagedPythonDownload {
         // to that date do not.
         #[cfg(unix)]
         {
-            match std::os::unix::fs::symlink(
+            match fs_err::os::unix::fs::symlink(
                 format!("python{}.{}", self.key.major, self.key.minor),
                 extracted.join("bin").join("python"),
             ) {