architecture for macos-14 which is now macos-latest

**Describe the bug**
macos-latest runners are now macos-14 and aarch64. In actions, these download julia for x64.

**To Reproduce**
See: https://github.com/JuliaStats/Distributions.jl/pull/1856#issuecomment-2119350142

**Expected behavior**
aarch64 platforms for macos runners should only download the aarch64 binaries or fail. 