Exception with the latest versions of networkx

[Morwenn]

Hi, I tried to use this library because it seemed like a really useful tool to analyze existing operations graphs, but it seems to be broken by the latest versions of networkx. When trying to call compose, I got the following exception:

    def _optionalized(graph, data):
        """Retain optionality of a `data` node based on all `needs` edges."""
>       all_optionals = all(e[2] for e in graph.out_edges(data, "optional", False))
E       TypeError: OutEdgeView.__call__() takes from 1 to 3 positional arguments but 4 were given

It didn't feel like an issue on my side, so I investigated a bit and found that the signature of some views changed a few months ago in networkx 3.2, with this commit being the most likely culprit: networkx/networkx@edd50e3

Fixing the networkx version to 3.1 solved the issue as expected. Usage of views should probably be adapted in graphtik to accommodate the latest changes in networkx.