Swapped out ItemGraphs -> Graphs for compatibility updates

[leerosenthalj]

Initial tests didn't break anything but some compatibility details in the Project.toml might need to be changed

[giordano]

Tests seem to be failing here.

[leerosenthalj]

Thanks for checking. Would it be possible for someone more familiar with this project to take a look at the changes? The tests are failing for me too, and I am not sure where the issue is.

[giordano]

Tests are passing on main though

[leerosenthalj]

Yup, the issue is definitely in my changes. The ItemGraphs compatibility is only an issue in one file, if someone else is willing to take a look that would be great

[leerosenthalj]

It's entirely in TimeScales.jl

[helgee]

I pushed a patch that fixes the tests. The problem was that add_vertex! used to return the vertex index in LightGraphs.jl but just returns true in Graphs.jl if the insert was successful.

Sorry for the long delay @leerosenthalj. I have been completely under water for the better part of two years now...

[giordano]

Yay, all green now, thanks everybody!