gh-90978: asyncio TestSSL uses SHORT_TIMEOUT (GH-92642)

TestSSL of asyncio now uses support.SHORT_TIMEOUT rather than
hardcoded timeouts like 5, 10 or 40 seconds.
(cherry picked from commit 1d1929fcb55f8fa9317c19ed4789e1dd6c435092)

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