add release notes

newsfragments/4410.added.md

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+* Added bindings for `PyList_GetItemRef` on Python 3.13 and newer. Also added
+  `ffi::compat::PyList_GetItemRef` which re-exports the FFI binding on Python
+  3.13 and newer and defines a compatibility shim on older versions. This
+  function returns an owned reference to the item in the list and should be
+  preferred if the list is not known *a priori* to be shared between threads.

newsfragments/4410.fixed.md

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+* Avoid creating temporary borrowed reference in list.get_item
+  bindings. Temporary borrowed references are unsafe in the free-threaded python
+  build if the list is shared between threads.