Test `test_autoscales` is flaky

[vdusek]

https://github.com/apify/crawlee-python/actions/runs/20742769552/job/59558985387

FAILED tests/unit/_autoscaling/test_autoscaled_pool.py::test_autoscales - assert 3 == 4
 +  where 3 = <crawlee._autoscaling.autoscaled_pool.AutoscaledPool object at 0x000002383A197550>.desired_concurrency
=========== 1 failed, 1589 passed, 26 skipped in 338.15s (0:05:38) ============