Update scikit-learn to version 1.5

[tomerbv]

Updates scikit-learn dependency from 1.3 to ~=1.5 with necessary compatibility fixes.

Changes by function:

sklearn_classifier

• Replaced deprecated MLRun utilities (get_sample, get_splits, gen_sklearn_model, eval_model_v2) with local
  implementations
• Fixed test artifact paths for local mode execution

auto_trainer

• Added monkey-patches for sklearn metrics to handle removed squared parameter (MLRun 1.10.0 compatibility)
• Updated tests to use get_or_create_project() instead of new_project()

gen_class_data

• Fixed test artifact path for local mode execution

describe

• Updated dependencies only

All functions:

• Updated requirements.txt: scikit-learn 1.3 → ~1.5
• Updated item.yaml and regenerated function.yaml