Prefect: Python 3.7 tests occasionally hang in CircleCI

[cicdw]

It appears that the printing of alice / bob in one of our executor tests occasionally makes stdout hang in CircleCI, causing the job to "timeout" even though the tests successfully passed. This is probably because I need to flush / clear the stdout in the tests somehow.

[cicdw]

This issue is still very much alive and well: https://circleci.com/gh/PrefectHQ/prefect/18870?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

[cicdw]

I believe this is now closed after removing coverage report generation from the 3.7 job.

[cicdw]

For the record this still happens occasionally, though not as often.