Remove Python package build dependencies once Python 3.14 wheels are available

[jtligon]

Background

PR #775 added system build dependencies for Python 3.14 because neither Pillow nor scipy have pre-built wheels for Python 3.14 yet:

• Pillow: libjpeg-dev, zlib1g-dev, libtiff-dev, etc.
• scipy: gfortran, libopenblas-dev, liblapack-dev

Once both packages publish Python 3.14 wheels to PyPI, these system dependencies become unnecessary overhead in CI.

When to act

Monitor PyPI for cp314 wheels:

• Pillow: https://pypi.org/project/pillow/#files
• scipy: https://pypi.org/project/scipy/#files

You'll also notice in CI logs:

• Currently: Building pillow==11.2.1 and Building scipy==1.16.0 (takes ~10-20s total)
• After wheels available: Downloaded pillow and Downloaded scipy (instant)

What to do

Once both packages have wheels available, merge the draft PR that removes the conditional dependency installation steps.

Draft PR

A draft PR is ready to merge once this condition is met: #796

Related

• chore: upgrade to Python 3.14 #775 - Python 3.14 upgrade PR
• ci: remove Python package build dependencies for Python 3.14 #796 - Draft PR to remove build dependencies