[3.14] gh-137109: refactor warning about threads when forking (GH-141438)#141614

gpshead merged 1 commit intopython:3.14python/cpython:3.14from

gpshead:claude/backport-781cc68-to-314-01HSABHvm74oTVhJNKK8BDHngpshead/cpython:claude/backport-781cc68-to-314-01HSABHvm74oTVhJNKK8BDHnCopy head branch name to clipboard