Update testing.yaml

[claireh93]

Roll back macOS for main branch to avoid errors.

[coveralls]

Pull Request Test Coverage Report for Build 3001460564

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 65.4%

---

Totals
Change from base Build 2775369842:	0.0%
Covered Lines:	1686
Relevant Lines:	2578

---

💛 - Coveralls

[codecov]

Codecov Report

Base: 73.25% // Head: 73.25% // No change to project coverage 👍

Coverage data is based on head (5c738b8) compared to base (508ba37).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #97   +/-   ##
=======================================
  Coverage   73.25%   73.25%           
=======================================
  Files          26       26           
  Lines        2004     2004           
=======================================
  Hits         1468     1468           
  Misses        536      536           

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