[MNT] drop python 3.8; support 3.13

[jdkent]

Closes # .

Changes proposed in this pull request:

• help facilitate [MAINT] bump to nilearn >= 0.12.1 #944

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR removes Python 3.8 support and adds Python 3.13 across CI pipelines and package metadata by updating workflow matrices, setup configuration, and requirement specifications.

Class diagram for updated Python version support in setup configuration

classDiagram
  class SetupConfig {
    - python_requires: ">= 3.9"
    - classifiers: ["Python :: 3.9", "Python :: 3.10", "Python :: 3.11", "Python :: 3.12", "Python :: 3.13"]
    - install_requires: ["cognitiveatlas>=0.1.11", "fuzzywuzzy", "jinja2", "joblib>=1.3.0", "matplotlib>=3.6.0"]
  }

Loading

File-Level Changes

Change	Details	Files
Revise CI workflows to drop 3.8 and add 3.13	Removed Python 3.8 from testing matrix and added 3.13 Updated individual job python-version settings to new supported versions Aligned linting and publish workflows to use Python 3.13	.github/workflows/testing.yml .github/workflows/linting.yml .github/workflows/python-publish.yml
Bump minimum Python requirement in setup configuration	Changed python_requires from >=3.8 to >=3.9 Removed importlib-resources fallback for Python <3.9 Updated PyPI classifiers to include 3.13 and drop 3.8	setup.cfg

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.23%. Comparing base (57b1ed7) to head (81b4c20).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #945      +/-   ##
==========================================
- Coverage   88.24%   88.23%   -0.02%     
==========================================
  Files          49       49              
  Lines        6782     6781       -1     
==========================================
- Hits         5985     5983       -2     
- Misses        797      798       +1     

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