Update dependencies

[SvenKlaassen]

Update Requirements

• Set "scikit-learn>=1.6", due to 'force_all_finite' was renamed to 'ensure_all_finite' in 1.6 and will be removed in 1.8.
  • Remove sklearn version check (

    doubleml-for-py/doubleml/utils/global_learner.py

    Line 11 in fb4bc14

    # TODO(0.11) can be removed if the sklearn dependency is bumped to 1.6.0

    )
• Further updates