[3.13] gh-127906: Backport test_cext changes from the main branch · python/cpython@5950829

pkgconf 2.3.0_1 is already installed and up-to-date. To reinstall 2.3.0_1, run: brew reinstall pkgconf

xz 5.6.3 is already installed and up-to-date. To reinstall 5.6.3, run: brew reinstall xz

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!