Update Pillow version constraint to support Python 3.14

[ben-bernanke]

Problem

The current Pillow constraint pillow = "^10.2.0" in pyproject.toml prevents installation on Python 3.14.

Python 3.14 only has pre-built wheels for Pillow 12.x, and Pillow 10.x fails to build from source on Windows due to C++ compatibility issues.

This blocks downstream packages like marker-pdf from supporting Python 3.14 (see marker issue #942).

Proposed Solution

Relax the Pillow upper bound constraint:

# Current
pillow = "^10.2.0"  # >=10.2.0, <11.0.0

# Proposed (option A - recommended)
pillow = ">=10.2.0"

# Proposed (option B - conservative)
pillow = ">=10.2.0,<13.0.0"

Environment

• Python 3.14
• Windows 11
• Pillow 12.x (only available wheel for Python 3.14)

Thank you!

[Br1an67]

I'd like to work on this. Relaxed the Pillow constraint from ^10.2.0 to >=10.2.0 to allow Pillow 11.x/12.x for Python 3.14 support.

PR: #489

[saipavanc]

Just to add, I encountered this error in Arch linux conda environment with python-3.14 as well.