[CozySocksAlways]

Desc

Python 3.9 reached end-of-life in October 2025. This PR drops it from the supported versions; Elephant now requires Python >= 3.10.

Changes

• pyproject.toml: requires-python raised to >=3.10; removed the 3.9 classifier.
• .github/workflows/CI.yml: removed 3.9 from FULL_MATRIX.
• .github/workflows/build_wheels.yml: added cp39-* to CIBW_SKIP to skip build
• requirements/environment.yml, requirements/environment-tests.yml: python>=3.10.
• doc/install.rst: supported versions updated to 3.10–3.14 (this also adds 3.14, which was missing).

ToDo

• In conversion.py:709, there is a TODO (from [Fix] slicing BinnedSpikeTrain with scipy>=1.15.0 #653 ) to raise scipy from >=1.10.0 to scipy>=1.15.0 once pytohn 3.9 is dropped.

[coveralls]

coverage: 88.224%. remained the same — CozySocksAlways:maintain/drop_python_39 into NeuralEnsemble:master