[cesarcoatl]

add CFLAGS environment variable

Summary by Sourcery

Expand stub CI coverage to Python 3.12 and standardize its compilation environment.

Enhancements:

• Configure stub type-checking environments to use a C17 compiler standard and include stub package data.

CI:

• Run the stubs tox workflow against Python 3.12.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR updates stub CI to run on Python 3.12, configures tox with GNU C17 compiler flags, and retains the required setuptools package-data settings.

File-Level Changes

Change	Details	Files
Expand the tox CI matrix to validate stubs with Python 3.12 and configure compilation flags for the type-checking environment.	Add Python 3.12 to the workflow's tested versions. Set CFLAGS to -std=gnu17 in tox. Preserve setuptools package-data configuration while normalizing its ordering.	.github/workflows/tox.yml stubs/tox.ini stubs/pyproject.toml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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