[3.12] CI: Make macOS required to succeed (GH-110362) (#130299)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Author: hugovk

.github/workflows/build.yml

@@ -559,7 +559,6 @@ jobs:
       uses: re-actors/alls-green@05ac9388f0aebcb5727afa17fcccfecd6f8ec5fe
       with:
         allowed-failures: >-
-          build_macos,
           build_ubuntu_ssltests,
           build_windows_msi,
           test_hypothesis,