Add support for Python 3.14 / remove 3.9, 3.10

[guillaume-vignal]

Summary

Python 3.14 is approaching release, and it would be great for Shapash to officially support it to ensure compatibility with modern environments and future distributions (e.g., Conda, Debian, Ubuntu 25.04, etc.).

Motivation

Many users and CI pipelines are starting to adopt newer Python versions shortly after release.
Ensuring Shapash runs smoothly under Python 3.14 will:

• Prevent installation issues in updated environments
• Maintain compatibility with key dependencies like numpy, pandas, and scipy
• Help downstream projects rely on Shapash without pinning older Python versions

Current Status

A quick PyPI metadata scan shows that most Shapash dependencies do not yet declare Python 3.14 support, though a few already do:

Package	Python 3.14 Support
numpy	✅
pandas	✅
scipy	✅
mypy	✅
pytest	✅
Sphinx	✅
Others (Dash, Flask, Plotly, Scikit-learn, etc.)	⚠️ Not yet declared

[guillaume-vignal]

🔎 Checking Python 3.14 support on PyPI...

✅ category_encoders supports Python 3.14
⚠️ dash-bootstrap-components does not yet declare support for Python 3.14
⚠️ dash-core-components does not yet declare support for Python 3.14
⚠️ dash-daq does not yet declare support for Python 3.14
⚠️ dash-html-components does not yet declare support for Python 3.14
⚠️ dash-renderer does not yet declare support for Python 3.14
⚠️ dash-table does not yet declare support for Python 3.14
⚠️ dash does not yet declare support for Python 3.14
⚠️ Flask does not yet declare support for Python 3.14
✅ matplotlib supports Python 3.14
⚠️ nbformat does not yet declare support for Python 3.14
✅ numba supports Python 3.14
✅ numpy supports Python 3.14
✅ pandas supports Python 3.14
⚠️ plotly does not yet declare support for Python 3.14
✅ scikit-learn supports Python 3.14
✅ scipy supports Python 3.14
✅ shap supports Python 3.14
⚠️ Jinja2 does not yet declare support for Python 3.14
⚠️ jupyter-client does not yet declare support for Python 3.14
⚠️ nbconvert does not yet declare support for Python 3.14
⚠️ notebook does not yet declare support for Python 3.14
⚠️ papermill does not yet declare support for Python 3.14
⚠️ phik does not yet declare support for Python 3.14
✅ pyarrow supports Python 3.14
⚠️ xgboost does not yet declare support for Python 3.14
⚠️ catboost does not yet declare support for Python 3.14
⚠️ lightgbm does not yet declare support for Python 3.14
⚠️ lime does not yet declare support for Python 3.14
⚠️ pre-commit does not yet declare support for Python 3.14
✅ mypy supports Python 3.14
✅ ruff supports Python 3.14
✅ pytest supports Python 3.14
⚠️ pytest-cov does not yet declare support for Python 3.14
⚠️ nbsphinx does not yet declare support for Python 3.14
⚠️ sphinx_material does not yet declare support for Python 3.14
✅ Sphinx supports Python 3.14
⚠️ sphinxcontrib-applehelp does not yet declare support for Python 3.14
⚠️ sphinxcontrib-devhelp does not yet declare support for Python 3.14
⚠️ sphinxcontrib-htmlhelp does not yet declare support for Python 3.14
⚠️ sphinxcontrib-jsmath does not yet declare support for Python 3.14
⚠️ sphinxcontrib-qthelp does not yet declare support for Python 3.14
⚠️ sphinxcontrib-serializinghtml does not yet declare support for Python 3.14