requirements, Fix CI: support Python 3.15 (#32199)
* requirements : support Python 3.15
torch 2.11.0, numpy 2.4, matplotlib 3.10, pandas 2.3, pillow 11.3 and
cffi 1.16 have no Python 3.15 wheels, so the CI runner on 3.15 cannot
install the requirements.
Python 3.15 gets the first releases that ship 3.15 wheels through
version markers, and every version below 3.15 stays as is.
pyproject.toml now allows 3.15 and picks torch 2.15.0 there.
* requirements : apply review suggestions
numpy 2.5.4 from Python 3.14, matplotlib 3.11.2 and pandas 3.0.6 from
3.11, cffi 2.1.1 and pillow 12.3.0 for every version. cffi 1.16.0 has
no 3.14 wheel and fails to build there, so this also fixes the
tokenizer test requirements on 3.14.
