`astartes` Patch Release 1.1.5

This patch release contains a bugfix in extrapolative sampling with train_test_split. Previously, random_state was effectively ignored when shuffling clusters inside of train_test_split since the max_shufflable_size was set based on the size of the validation set (which is zero here). Thanks to @kspieks for the quick fix and @PatWalters for reporting it!