Update ui test with public path of UniquePtrTarget
diff --git a/tests/ui/unique_ptr_twice.stderr b/tests/ui/unique_ptr_twice.stderr
index 5686cf1..03093eb 100644
--- a/tests/ui/unique_ptr_twice.stderr
+++ b/tests/ui/unique_ptr_twice.stderr
@@ -1,4 +1,4 @@
-error[E0119]: conflicting implementations of trait `cxx::private::UniquePtrTarget` for type `here::C`:
+error[E0119]: conflicting implementations of trait `cxx::memory::UniquePtrTarget` for type `here::C`:
   --> $DIR/unique_ptr_twice.rs:16:5
    |
 7  |     impl UniquePtr<C> {}