[3.13] gh-137335: remove a mktemp use in multiprocessing.connection to avoid security scanner noise (GH-148578) (#148584)

gh-137335: remove a mktemp use in multiprocessing.connection to avoid security scanner noise (GH-148578)

remove a mktemp use to avoid security scanner noise
(cherry picked from commit fd81246bd55e4fab1976a7cca3e5d42582dbdac0)

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>