Fix flaky test_max_poll_interval_ms

[ods]

Changes

Fixes flakiness of tests/test_consumer.py::TestConsumerIntegration::test_max_poll_interval_ms test:

        await listener1.assignment_ready.wait()
        await listener2.assignment_ready.wait()
>       self.assertTrue(consumer1.assignment())
E       AssertionError: set() is not true

tests/test_consumer.py:2024: AssertionError

[codecov]

Codecov Report

Merging #903 (bdf014b) into master (5ce5649) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #903   +/-   ##
=======================================
  Coverage   97.59%   97.59%           
=======================================
  Files          30       30           
  Lines        5451     5451           
=======================================
  Hits         5320     5320           
  Misses        131      131           

Flag	Coverage Δ
cext	88.44% <ø> (+0.03%)	⬆️
integration	97.56% <ø> (ø)
purepy	97.10% <ø> (-0.04%)	⬇️
unit	38.10% <ø> (ø)

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