sleep for neg max_age test

Author: shaypal5

tests/test_call_with_max_age.py

@@ -92,6 +92,7 @@ def f(x):
 
     f.clear_cache()
     v1 = f(1)
+    time.sleep(0.5)  # Ensure some time has passed
     v2 = f(1, max_age=timedelta(seconds=-1), cachier__verbose=True)
     assert v2 != v1  # Negative max_age always triggers recalc