Complete OpenCV 4.9.0 chnagelog: https://github.com/opencv/opencv/wiki/ChangeLog

Python:
- #24023, #24022, #23910 Added type stub generation for missed types and manually wrapped types.
- #24026 Added read-only flag handling for Numpy arrays.
- #24028 Fixed exception handling and bindings for in module.
- #23958 Improved error messages in Numpy array type handling.
- #24468 Fixed constructors documentation in Python.
- Mac OS builds migrated to Mac OS 12. It's minimal supported version now.