[3.12] gh-38807: Fix race condition in Lib/trace.py (GH-110143) (GH-114206)

Instead of checking if a directory does not exist and thereafter
creating it, directly call os.makedirs() with the exist_ok=True.
(cherry picked from commit 78fcde039a33d8463e34356d5462fecee0f2831a)

Co-authored-by: buermarc <44375277+buermarc@users.noreply.github.com>