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.