[3.11] gh-109917: Fix test instability in test_concurrent_futures (GH-110306)#110316

cjw296 merged 1 commit intopython:3.11python/cpython:3.11from

miss-islington:backport-a376a72-3.11miss-islington/cpython:backport-a376a72-3.11Copy head branch name to clipboard