Fix missing argument in StratifiedKFold.split()

[Programmer-RD-AI]

In the evaluate_model_CV method of the generic_task.py module, the StratifiedKFold.split() method was missing a required positional argument 'y'. This caused a TypeError when attempting to split the dataset for cross-validation.

To address this issue #1303, I added the missing 'y' argument to the StratifiedKFold.split() method call. The corrected line of code now reads:

kf = kf.split(X_train_split, y_train_split)

This modification ensures that the StratifiedKFold cross-validation splits the dataset correctly, allowing the AutoML fit method to run without encountering errors.

This fix resolves the issue reported in the FLAML library when using custom StratifiedKFold cross-validation.

Why are these changes needed?

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• [ ] I've made sure all auto checks have passed.

[Programmer-RD-AI]

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