Revert one more incorrect cherry-pick

docs/_gen_figures/gen_datasets_repository.py

@@ -1,7 +1,7 @@
 import numpy as np
 from light_dark import mk_light_dark
 from matplotlib.pyplot import get_cmap
-from wildboar.utils.variable_len import is_end_of_series
+from wildboar import iseos
 from wildboar.datasets import load_dataset, load_gun_point
 from wildboar.datasets.preprocess import minmax_scale, truncate