Test `test_keep_alive` is flaky

https://github.com/apify/crawlee-python/actions/runs/20275644676/job/58223434638?pr=1620

```
FAILED tests/unit/crawlers/_basic/test_basic_crawler.py::test_keep_alive[keep_alive, but max_requests_per_crawl achieved after 1 request]
```