Update Lib/test/test_free_threading/test_generators.py

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

Author: ZeroIntensity

Lib/test/test_free_threading/test_generators.py

@@ -10,7 +10,7 @@ def test_generator_send(self):
         import threading
 
         def gen():
-            for _ in range(5000):
+            for _ in range(5_000):
                 yield