PeriodicCallback._run was never awaited
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flaky test
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- Python
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Description
In a couple of different test failures we're seeing RuntimeWarnings about the tornado 6.2 PC
e.g. https://github.com/dask/distributed/actions/runs/3827226701/jobs/6511631823
```
FAILED distributed/tests/test_actor.py::test_client_actions[True] - pytest.PytestUnraisableExceptionWarning: Exception ignored in:
Traceback (most recent call last):
File "/usr/share/miniconda3/envs/dask-distributed/lib/python3.11/warnings.py", line 537, in _warn_unawaited_coroutine
warn(msg, category=RuntimeWarning, stacklevel=2, source=coro)
RuntimeWarning: coroutine 'PeriodicCallback._run' was never awaited
```
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