pythongh-109565: Fix concurrent.futures test_future_times_out()

as_completed() uses a timeout of 100 ms instead of 10 ms. Windows
monotonic clock resolution is around 15.6 ms.

Author: vstinner

Lib/test/test_concurrent_futures/test_as_completed.py

@@ -42,11 +42,14 @@ def test_future_times_out(self):
                              EXCEPTION_FUTURE,
                              SUCCESSFUL_FUTURE}
 
-        for timeout in (0, 0.01):
+        # Windows clock resolution is around 15.6 ms
+        short_timeout = 0.100
+        for timeout in (0, short_timeout):
             with self.subTest(timeout):
 
-                future = self.executor.submit(time.sleep, 0.1)
                 completed_futures = set()
+                future = self.executor.submit(time.sleep, short_timeout * 10)
+
                 try:
                     for f in futures.as_completed(
                         already_completed | {future},