graphics/py-pillow: Update to 11.1.0

• Update WWW
• Adjust options:
  • Remove PNG option: jpeg and zlib are required by default
  • Add AVIF option
• Convert to USE_PYTHON=pytest

Changes: https://github.com/python-pillow/Pillow/releases

		https://pillow.readthedocs.io/en/stable/releasenotes/