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Task: Fix ImportError for to categorical from Keras Utils

Task: Fix ImportError for to categorical from Keras Utils: a task in Terminal-Lego-15k (Harbor dataset). When using newer versions of Keras (2.6+ bundled with TensorFlow 2.6+), the import path from keras.utils import to categorical may fail with:

The task

When using newer versions of Keras (2.6+ bundled with TensorFlow 2.6+), the import path `from keras.utils import to_categorical` may fail with:

Part of PrimeIntellect/Terminal-Lego-15k.