Adapt skore to be compliant on python >=3.9

[thomass-dev]

Actually, skore only enforce compatibility with python >=3.12, but scikit-learn allows python >= 3.9.
Related issue #388 .

[augustebaum]

Does this issue include adding a test pipeline for all supported versions?

[tuscland]

I think this falls in the larger project of testing skore on multiple environments.

cc @jerome-probabl

[thomass-dev]

Does this issue include adding a test pipeline for all supported versions?

There is already an issue on this need #388 .

I think this falls in the larger project of testing skore on multiple environments.

cc @jerome-probabl

Not sure, its only a question of python versions, not multiple environments.

[tuscland]

The Python version is a part of the environment.

[thomass-dev]

My point is that github-actions tools already seem to exist to test a package on several python versions.