gh-134262: Fix off by one errors in download retry functions · python/cpython@807673e

pkgconf 2.4.3 is already installed and up-to-date. To reinstall 2.4.3, run: brew reinstall pkgconf

xz 5.8.1 is already installed and up-to-date. To reinstall 5.8.1, run: brew reinstall xz

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!