Update Library/Homebrew/test_runner_formula.rb

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>

Author: ivan-digital

Library/Homebrew/test_runner_formula.rb

@@ -35,7 +35,7 @@ def macos_compatible?
 
   sig { returns(T::Boolean) }
   def linux_only?
-    formula.requirements.any?(LinuxRequirement)
+    !macos_compatible?
   end
 
   sig { returns(T::Boolean) }