[3.13] GH-109975: Announce final release in What's New in Python 3.13 (GH-125007) (#125033)

Prepare What's New in Python 3.13 for final release
(cherry picked from commit 31516c98dd7097047ba10da8dcf728c3d580f3d6)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
2 files changed