Update aruba dependency
Created by: mvz
Updates Aruba to latest release (0.14.8 0.14.9) and fixes deprecations.
Incorporates a commit from the aruba_fix
branch (5ce82406) and (parts of) commits from #2459.
An important criterion in reviewing this is whether the resulting code is acceptable: Many helper methods were deprecated in Aruba but perhaps some were actually very useful and should be restored.