Inconsistent np.load in TimeIntervalInterpolator

[reneburghardt]

Just a minor thing, but np.load has either allow_pickle=False (default of np.load) when cache_data == True

if self.cache_data:
    self.labeled_intervals = {
        label: np.load(self.root_folder / filename)
        for label, filename in self.meta_labels.items()
    }

or allow_pickle=True explicitly when cache_data == False

else:
    intervals = np.load(self.root_folder / filename, allow_pickle=True)

I think we should make this consistent. @pollytur @oliveira-caio just for your notice

[abdelrahman725]

I can work on this, can you assign me @reneburghardt