[3.9] bpo-40360: Handle PendingDeprecationWarning in test_lib2to3. (GH-21694)#21696

miss-islington wants to merge 1 commit intopython:3.9python/cpython:3.9from

miss-islington:backport-cadda52-3.9miss-islington/cpython:backport-cadda52-3.9Copy head branch name to clipboard