klayout is missing libruby.so.2.5

[ubfx]

When I install klayout via conda on Ubuntu (github runner and codespaces), I get the following runtime error:

$ klayout -v
klayout: error while loading shared libraries: libruby.so.2.5: cannot open shared object file: No such file or directory

I then need to manually install ruby, but other times it only works when installing a specific version around 2.5 like ruby==2.5.1. Is there a reason the package depends on such an old ruby version and can the dependency be handled on the conda side?

cc @proppy, @joamatab