pillow: bump to 12.1.1

pillow: bump to 12.1.1

Pillow 12.x introduces pybind11-based C extension bindings and a
custom build backend (wrapping setuptools.build_meta). This requires:
- Replacing python-setuptools-scm with python-setuptools as build dep
- Adding python-pybind11 as a new build dependency (host)
- Updating build config settings from --build-option flags to the new
  key=value format (e.g. zlib=enable, imagequant=disable)
- Removing the separate webpmux flag (merged into webp feature)

Full release notes:
https://pillow.readthedocs.io/en/stable/releasenotes/index.html

Remove 001-remove-setuptools-version-limit.patch
That's an old relic since when setuptools was packaged inside Python3

Signed-off-by: Alexandru Ardelean <redacted>