bpo-35601: Alleviate race condition when waiting for SIGALRM in test_asyncio (GH...

bpo-35601: Alleviate race condition when waiting for SIGALRM in test_asyncio (GH-11337)

There is a race condition regarding signal delivery in test_signal_handling_args for
test_asyncio.test_events.KqueueEventLoopTests. The signal can be received at any moment outside the time window provided in the test. The fix is to wait for the signal to be received instead with a bigger timeout.
(cherry picked from commit 5471420faa84519530f29b08f2b042b2288e3e96)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>