Bump scikit-learn from 1.4.1.post1 to 1.6.0 #4904

Job	Run time
Run attacks_1 legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	52m 37s
Run attacks_1 legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	52m 37s
Run attacks_2 legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	17m 24s
Run attacks_2 legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	17m 24s
Run estimators legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	8m 51s
Run estimators legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	10m 10s
Run defences legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	15m 14s
Run defences legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	15m 14s
Run metrics legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	7m 14s
Run metrics legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	7m 14s
Run art legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	6m 26s
Run art legacy (TensorFlow 2.14.0 Keras 2.14.0 PyTorch 1.13.1 scikit-learn 1.6.0 Python 3.9) Tests	6m 26s
	3h 36m 51s

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