test on lts and pre

[hexaeder]

No description provided.

[hexaeder]

Julia 1.11 changes the random streams. Unfortunately, that means basically all ref tests broke. Not sure how to prevent this in the future without cluttering the examples with explicit stable rng code and pass it to the layout kw of every single plot command...

[mtfishman]

We're facing the same issues in our tests. Besides passing around a StableRNG the other alternative I could think of is having version-dependent reference images, i.e. store one set of images for Julia 1.10, one for Julia 1.11, etc. (I'll do that for now since the StableRNGs.jl approach requires JuliaGraphs/NetworkLayout.jl#65 but I'm not sure how automated it will be, i.e. it will be annoying to have to generate new images for now versions so that ideally should be automated).