Update Library/Homebrew/test_runner_formula.rb

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

Author: ivan-digital

Library/Homebrew/test_runner_formula.rb

@@ -25,7 +25,7 @@ def initialize(formula, eval_all: Homebrew::EnvConfig.eval_all?)
 
   sig { returns(T::Boolean) }
   def macos_only?
-    formula.requirements.any?(MacOSRequirement)
+    !linux_compatible?
   end
 
   sig { returns(T::Boolean) }