Widen scikit-learn constraint to <2

[pmrv]

Pull Request Template

Description of Changes

Widens the scikit-learn version constraint in setup.py from scikit-learn<=1.4.2 to scikit-learn<2, allowing installation alongside current scikit-learn 1.x releases.

The <=1.4.2 pin dates back to a blanket version-pinning commit (0ad96ce) that also pinned numpy and pandas; those two constraints have since been widened (numpy<3, pandas>=2,<4) while scikit-learn was left behind. The only scikit-learn usage in the codebase is Ridge from sklearn.linear_model (src/pyace/linearacefit.py), a stable API across 1.x releases, so an upper bound at the next major version matches the style used for the other dependencies.

Checklist

• Code is well-documented.
• All tests have been run and passed.
• Relevant documentation has been updated if necessary.

License Agreement

By submitting this pull request, I agree that:

• The code submitted in this pull request will be distributed under the Academic Software License (free for academic non-commercial use, not free for commercial use), see LICENSE.md for more details.
• The copyright for the code, including the submitted code, remains with Ruhr University Bochum. Ruhr University Bochum retains the right to transfer or modify the copyright.

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