Update to work with GLMakie

[pablosanjose]

Makie is getting deprecated in favor of backend-specific packages.

This replaces the Makie functionality with GLMakie functionality. For the end user all should remain the same, but instead of doing

] add Makie
using Makie
plot(ham)

one should now do

] add GLMakie
using GLMakie
plot(ham)

[pablosanjose]

Merging despite the CI errors, which should be unrelated to this (probably due to the recent 1.6 release)