[3.12] gh-110662: multiprocessing test_async_timeout() increase timeout (GH-110663) (#110674)

gh-110662: multiprocessing test_async_timeout() increase timeout (GH-110663)

Increase timeout from 1 second to 30 seconds, if not longer. The
important part is that apply_async() takes longer than TIMEOUT2.
(cherry picked from commit 790ecf6)

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

Author: miss-islington

Lib/test/_test_multiprocessing.py

@@ -2578,7 +2578,7 @@ def test_async(self):
         self.assertTimingAlmostEqual(get.elapsed, TIMEOUT1)
 
     def test_async_timeout(self):
-        res = self.pool.apply_async(sqr, (6, TIMEOUT2 + 1.0))
+        res = self.pool.apply_async(sqr, (6, TIMEOUT2 + support.SHORT_TIMEOUT))
         get = TimingWrapper(res.get)
         self.assertRaises(multiprocessing.TimeoutError, get, timeout=TIMEOUT2)
         self.assertTimingAlmostEqual(get.elapsed, TIMEOUT2)