CI(pytest): Run pytest tests with Python 3.13

[echoix]

Also replace Python 3.8 by Python 3.9 to keep 3 versions tested.

Closes #4203

[wenzeslaus]

Agreed, we should test the whole range (so also the oldest one we support which is 3.9).

[echoix]

Would we want to install a specific Python version in the Ubuntu gunittest (the full one), and keep the one from Ubuntu in the minimal tests?

[wenzeslaus]

Would we want to install a specific Python version in the Ubuntu gunittest (the full one), and keep the one from Ubuntu in the minimal tests?

So far the logic was default Ubuntu config PLUS (full OR minimal) configuration of GRASS GIS. If one would have a version specified, then maybe the full one should have latest Python release and the minimal one should have the oldest supported release.

[echoix]

Would we want to install a specific Python version in the Ubuntu gunittest (the full one), and keep the one from Ubuntu in the minimal tests?

So far the logic was default Ubuntu config PLUS (full OR minimal) configuration of GRASS GIS. If one would have a version specified, then maybe the full one should have latest Python release and the minimal one should have the oldest supported release.

That's what I've been imagining for a long time. I feel that currently, there isn't much difference between the two configs. The full isn't really full config (not all optional configuration options and libraries are there), and I think the min isn't the most trimmed down (there's still some --with- in the configure call).