Add changelog entry

Author: mdboom

cuda_bindings/docs/source/release/13.X.Y-notes.rst

@@ -14,6 +14,8 @@ Highlights
 
 * Automatic CUDA library path detection based on ``CUDA_HOME``, eliminating the need to manually set ``LIBRARY_PATH`` environment variables for installation.
 
+* The Python overhead of calling functions in CUDA bindings in `driver`, `runtime` and `nvrtc` has been reduced by approximately 30%.
+
 
 Known issues
 ------------