squared argument is deprecated

[bhargav-borah]

In FeatureSelector.py, RMSE is implemented along the lines of mean_squared_error(y_true, y_pred, squared=False). However, the squared argument has deprecated in scikit-learn 1.6.0. Potentially, sklearn's root_mean_squared_error can be used for the same purpose.

[ExodusG0d]

modified the code to calculate RMSE by first calculating MSE using mean_squared_error and then taking the square root using np.sqrt()