Fix unstable (though rare) verification test failures

[marcin-trust]

Sometimes verification tests fail CI on some integration parts. Unit tests and CI runs should be infra agnostic/reliable. Fix this

See: https://github.com/EthWorks/Mars/runs/4659517684?check_suite_focus=true

Verification 579 | 1) does not throw if verification fails 580 | 581 | 582 | 129 passing (15s) 583 | 1 failing 584 | 585 | 1) Verification 586 | does not throw if verification fails: 587 | Error: Request failed with status code 502