test: Relax timing assertion in test_abort_works to fix flaky test (#1754)

## Summary

- `test_abort_works` was flaky on CI due to an overly tight timing
assertion (`< 0.3s`), which left only ~0.2s of headroom after the
initial `asyncio.sleep(0.1)`.
- Relaxed the threshold to `5s`, which still validates that `abort()`
cancels tasks promptly (vs the 60s task sleep) while being resilient to
CI scheduling jitter.

## Failed CI runs
-
https://github.com/apify/crawlee-python/actions/runs/22064841619/job/63753881516
-
https://github.com/apify/crawlee-python/actions/runs/22095987878/job/63853075484

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: vdusek

tests/unit/_autoscaling/test_autoscaled_pool.py

@@ -87,7 +87,7 @@ async def run() -> None:
         await run_task
 
     assert elapsed.wall is not None
-    assert elapsed.wall < 0.3
+    assert elapsed.wall < 5
 
 
 async def test_propagates_exceptions(system_status: SystemStatus | Mock) -> None: