[3.13] gh-109413: Fix libregrtest get_running() (GH-127153) (#127157) gh-109413: Fix libregrtest get_running() (GH-127153) Skip threads which are not running. (cherry picked from commit 0cb20177d667f0058f3d8d808abaf340e8345f04) Co-authored-by: Victor Stinner <[email protected]>