Silence brew during workflows

[abhinavsingh]

Brew workflows are randomly failing. Example

• https://github.com/abhinavsingh/proxy.py/runs/7080443584?check_suite_focus=true

[codecov]

Codecov Report

Merging #1210 (6a2f265) into develop (2e53536) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1210      +/-   ##
===========================================
- Coverage    87.16%   87.09%   -0.08%     
===========================================
  Files          166      166              
  Lines         7019     7019              
  Branches       721      721              
===========================================
- Hits          6118     6113       -5     
- Misses         779      782       +3     
- Partials       122      124       +2     

Flag	Coverage Δ
pytest	86.89% <ø> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
proxy/core/work/threadless.py	81.28% <0.00%> (-1.98%)	⬇️
proxy/http/handler.py	75.22% <0.00%> (-0.89%)	⬇️
proxy/core/event/subscriber.py	75.86% <0.00%> (+1.14%)	⬆️

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