[3.13] gh-112953: Update news to finish 3.13 as main (GH-129877)#129878

terryjreedy merged 1 commit intopython:3.13python/cpython:3.13from

miss-islington:backport-f72977b-3.13miss-islington/cpython:backport-f72977b-3.13Copy head branch name to clipboard