The continuous integration test runners for MacOS keeps timing out on the installing Julia dependencies step.

This PR for example is marked to auto merge once the tests pass, but twice in a row the MacOS test has hung for 6 hours then timed out:
https://github.com/ReactionMechanismGenerator/RMG-Py/actions/runs/5158881342

If we keep the MacOS test as a requirement for merging, it is going to hold everything up, unless we can figure out why that step is hanging and fix it.