Fix imap test RuntimeWarning

[cdce8p]

Proposed change

Let's fix some pytest warnings!

  /home/runner/work/core/core/tests/conftest.py:243: RuntimeWarning: coroutine 'AsyncMockMixin._execute_mock_call' was never awaited
  Coroutine created at (most recent call last)
    ...
    File "/home/runner/work/core/core/homeassistant/components/imap/coordinator.py", line 408, in _async_wait_push_loop
      await self.imap_client.wait_server_push()
    File "/opt/hostedtoolcache/Python/3.11.4/x64/lib/python3.11/unittest/mock.py", line 2248, in _execute_mock_call
      result = await effect(*args, **kwargs)
    File "/home/runner/work/core/core/tests/components/imap/test_init.py", line 482, in _sleep_till_event
      mock_imap_protocol.idle_start.return_value = AsyncMock()()
    ...

Type of change

• Dependency upgrade
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• Breaking change (fix/feature causing existing functionality to break)
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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @jbouwh, mind taking a look at this pull request as it has been labeled with an integration (imap) you are listed as a code owner for? Thanks!

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[jbouwh]

Looks good,
Thnx @cdce8p,