Log Message:
py-pillow_heif: update to 0.20.0nb1.

## [0.20.0 - 2024-10-19]

### Added

- Initial support for parsing auxiliary images. #297 Thanks to @johncf

### Changed

- libheif updated from `1.18.1` to `1.18.2` version. #278
- Dropped `Python 3.8` support. #293

### Fixed

- More accurate error handling in the `C` module. #298 Thanks to @johncf
- Support for `Pillow` **11.0.0** #294