Investigate asyncio CancelledError in test_list_secrets on Juju 3.3, 3.4, 3.5

[james-garner-canonical]

Description

tests/integration/test_secrets.py::test_list_secrets seems to be consistently failing with juju 3.3, 3.4 and 3.5 (passes on 3.1) with an asyncio.exceptions.CancelledError

e.g.

Traceback (most recent call last):
  File "/home/runner/work/python-libjuju/python-libjuju/tests/integration/test_secrets.py", line 41, in test_list_secrets
    await model.wait_for_idle(status="active")
  File "/home/runner/work/python-libjuju/python-libjuju/juju/model.py", line 2973, in wait_for_idle
    await jasyncio.sleep(check_freq)
  File "/opt/hostedtoolcache/Python/3.10.15/x64/lib/python3.10/asyncio/tasks.py", line 605, in sleep
    return await future
asyncio.exceptions.CancelledError

Fully outputs for 3.3, 3.4 and 3.5 respectively:

• https://github.com/juju/python-libjuju/actions/runs/11715691458/job/32632520992
• https://github.com/juju/python-libjuju/actions/runs/11715691458/job/32632521515
• https://github.com/juju/python-libjuju/actions/runs/11715691458/job/32632521625

Urgency

Annoying bug in our test suite

Python-libjuju version

main

Juju version

3.3, 3.4, 3.5

Reproduce / Test

...