Run CI on Python 3.12 and 3.13

[madhavzanwar]

Fixes #263

The Tests workflow has failed on every run at "Install dependencies", because requirements.txt needs numpy>=2.5.2 and scikit-learn>=1.9.0 and neither can be installed on Python 3.10 (numpy tops out at 2.2.6, scikit-learn has no 3.10 build) or on 3.11 (numpy tops out at 2.4.6).

Change
One line in .github/workflows/test.yml: the matrix goes from ['3.10', '3.11'] to ['3.12', '3.13'].

Checks

• Resolving requirements.txt with pip install --dry-run --python-version <v> --only-binary=:all: fails on 3.10 and 3.11 and succeeds on 3.12 and 3.13.
• On Python 3.13 the unit tests pass locally and the flake8 gate in the workflow is clean.
• I couldn't run the workflow itself, so a later step could still fail. I'll fix anything that shows up after the install step.

If 3.10 or 3.11 must stay supported, I can lower the numpy and scikit-learn floors instead.

AI assistance was used for this change; the tests were run before submitting.

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