[3.12] gh-109706: Fix multiprocessing test_nested_startmethod() (GH-109707) (#109762)

gh-109706: Fix multiprocessing test_nested_startmethod() (GH-109707)

Don't check order, queue items can be written in any order.
(cherry picked from commit b03a791497ff4b3c42805e06c73d08ac34087402)

Co-authored-by: Victor Stinner <vstinner@python.org>