1207 Fix Mac CI

[lifflander]

Fixes #1207

[codecov]

Codecov Report

Merging #1208 (69bda92) into develop (64c3be4) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1208      +/-   ##
===========================================
- Coverage    81.02%   80.99%   -0.03%     
===========================================
  Files          730      730              
  Lines        28046    28046              
===========================================
- Hits         22723    22717       -6     
- Misses        5323     5329       +6     

Impacted Files	Coverage Δ
src/vt/termination/dijkstra-scholten/comm.cc	54.54% <0.00%> (-12.73%)	⬇️
tests/unit/atomic/test_atomic.cc	100.00% <0.00%> (+1.31%)	⬆️

[lifflander]

Turns out that the Mac CI fix is easily than I thought--stop upgrading it before installing the packages.

[cz4rs]

Great!

[PhilMiller]

I'm fine with this.

Does Homebrew keep older versions available indefinitely, so that whatever is referenced from the index in the image will install nicely? If not, this is going to break with some regularity and require manual updates. Still better than being continuously broken right now.

[lifflander]

I'm fine with this.

Does Homebrew keep older versions available indefinitely, so that whatever is referenced from the index in the image will install nicely? If not, this is going to break with some regularity and require manual updates. Still better than being continuously broken right now.

Not sure about homebrew... but I don't think they keep old versions on the platform. homebrew comes pre-installed on the image