bug in find_heuristic_1pc()

Getting the following error trace

File "/home/alex/projects/medil/.devenv/state/venv/lib/python3.12/site-packages/medil/models.py", line 211, in assign_dof self._compute_biadj() File "/home/alex/projects/medil/.devenv/state/venv/lib/python3.12/site-packages/medil/models.py", line 236, in _compute_biadj self.biadj = find_heuristic_1pc(self.udg) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/alex/projects/medil/.devenv/state/venv/lib/python3.12/site-packages/medil/ecc_algorithms.py", line 249, in find_heuristic_1pc edge TypeError: unhashable type: 'numpy.ndarray'

when using this example_graph.txt