Tests: Flakyness within "doctests/itests.txt"

[amotl]

Apparently, it only happens on macOS so far, maybe when picking a slow runner.

File "/Users/runner/work/crate-python/crate-python/src/crate/client/sqlalchemy/doctests/itests.txt", line 83, in itests.txt
Failed example:
    (now - location.datetime_tz).seconds < 4
Expected:
    True
Got:
    False

-- https://github.com/crate/crate-python/actions/runs/3180929220/jobs/5185222240#step:4:358 -- https://github.com/crate/crate-python/actions/runs/3198878846/jobs/5223969314#step:4:337 -- https://github.com/crate/crate-python/actions/runs/3218660768/jobs/5263106301#step:4:440