Temporarly fix Scikit-Learn Version to smaller than 1.6.0

[OliverSchacht]

Description

Change setup and requirements to require an older version of sci-kit learn to avoid failing unit tests due to xgboost.

Reference to Issues or PRs

#278 and dmlc/xgboost#11093

Comments

XGBoost has a fix on main, we can reverse this as soon as they have a new release.

PR Checklist

• The title of the pull request summarizes the changes made.
• The PR contains a detailed description of all changes and additions.
• References to related issues or PRs are added.
• The code passes all (unit) tests.
• Enhancements or new feature are equipped with unit tests.
• The changes adhere to the PEP8 standards.