New fonts on 1.11

[etiennedeg]

Fonts have changed on 1.11(see the 3's in the labels). Probably not related to Arnoldi, I don't know the dependency responsible. It causes tests to fail on nightly. I find the new font a bit prettier, but also slightly smaller, so it can hurt readability (because the labels are already pretty small). I don't know if it is a big deal...