gh-109413: Enable `strict_optional = true` for `libregrtest/run_workers` · python/cpython@676e426

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HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!