bug: Fix flacky test TestReaderReconnector.test_reconnect_on_repeatable_error

[rekby]

Version: 3.9.0
https://github.com/ydb-platform/ydb-python-sdk/actions/runs/8550788104/job/23428448725?pr=406

https://gist.github.com/rekby/1f975c053f387d2b0a17ddfdf8a6668e