rust-cpython: use PyList.insert() instead of .insert_item()

Silences the deprecated warning.

https://github.com/dgrunwald/rust-cpython/commit/e8cbe864841714c5555db8c90e057bd11e360c7f

rust/hg-cpython/src/dirstate/status.rs

@@ -33,7 +33,7 b' fn collect_pybytes_list<P: AsRef<HgPath>'
     let list = PyList::new(py, &[]);
 
     for (i, path) in collection.iter().enumerate() {
-        list.insert_item(
+        list.insert(
             py,
             i,
             PyBytes::new(py, path.as_ref().as_bytes()).into_object(),