Describe the bug

I'm trying to run a cross validation using ProximityStump classifier, but I get this error.
I was looking at the code and I guess that the problem is at this line:
https://github.com/alan-turing-institute/sktime/blob/3f132219e5217ba3dba4b0237f15ea847a84d5f5/sktime/classification/distance_based/_proximity_forest.py#L814
The "name" get_exemplars is replaced to pick_exemplars. Should it be changed?
Looking at ProximityTree it stays as it is:
https://github.com/alan-turing-institute/sktime/blob/3f132219e5217ba3dba4b0237f15ea847a84d5f5/sktime/classification/distance_based/_proximity_forest.py#L1061

To Reproduce

from sklearn.model_selection import cross_val_predict

cross_val_predict(base_model, X, y, cv=..., ...)

I am using ProximityStump as "base_model". X and y are from Chinatown dataset.
Expected behavior

It should work as fine as other sktime classifiers - ProximityForest and ProximityTree work great!
Additional context

I am working alongside Prof. Diego Furtado Silva in a project about Meta-Learning.

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