pytest-asyncio 0.25.1 breaks our Playwright tests

[manics]

Bug description

pytest-asyncio 0.25.1 was released on Jan 2, 2025, and it's broken our Playwright tests on GitHub CI.

• https://github.com/jupyterhub/binderhub/actions/workflows/playwright.yaml

Pinning to less that 0.25.1 allows the tests to pass:

• manics@08a9b41
• https://github.com/manics/binderhub/actions/runs/12630588324

How to reproduce

See recent runs of https://github.com/jupyterhub/binderhub/actions/workflows/playwright.yaml

==================================== ERRORS ====================================
_ ERROR at teardown of test_loading_page[firefox-gh-binderhub-ci-repos/requirements-master---200] _

request = <SubRequest 'event_loop' for <Coroutine test_loading_page[firefox-gh-binderhub-ci-repos/requirements-master---200]>>

    @pytest.fixture
    def event_loop(request: FixtureRequest) -> Iterator[asyncio.AbstractEventLoop]:
        """Create an instance of the default event loop for each test case."""
        new_loop_policy = request.getfixturevalue(event_loop_policy.__name__)
>       with _temporary_event_loop_policy(new_loop_policy):

/opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/site-packages/pytest_asyncio/plugin.py:1150: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/contextlib.py:144: in __exit__
    next(self.gen)
/opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/site-packages/pytest_asyncio/plugin.py:775: in _temporary_event_loop_policy
    current_loop.close()
/opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/asyncio/unix_events.py:68: in close
    super().close()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <_UnixSelectorEventLoop running=True closed=False debug=False>

    def close(self):
        if self.is_running():
>           raise RuntimeError("Cannot close a running event loop")
E           RuntimeError: Cannot close a running event loop

/opt/hostedtoolcache/Python/3.12.8/x64/lib/python3.12/asyncio/selector_events.py:101: RuntimeError

Related issue: #1894