[Bug]: Cairo backends don't render italic text #28452

Bug summary

The anatomy example uses italic text for its annotations. When running with TkCairo (or any other Cairo-based backend), this text is just upright.

Code for reproduction

MPLBACKEND=TkCairo python galleries/examples/showcase/anatomy.py

Actual outcome

Expected outcome

Additional information

No response

Operating system

Fedora 40

Matplotlib Version

d7d1bba

Matplotlib Backend

TkAgg/TkCairo

Python version

3.12.3

Jupyter version

n/a

Installation

git checkout