Context

error seen in "install from SDist and Test" github action – for example here: https://github.com/mongodb/mongo-python-driver/actions/runs/26484047833/job/77987534427?pr=2813

error states that: Overriding the "event_loop_policy" fixture is deprecated and will be removed in a future version of pytest-asyncio. Use the "pytest_asyncio_loop_factories" hook to customize event loop creation.

edit: I think pytest_asyncio_loop_factories is per test and that'd be really annoying to modify every test to use a different loop if its windows but i think asyncio.set_event_loop_policy can change it globally for windows similar to what we did with pytest's event_loop_policy? 

Definition of done

What must be done to consider the task complete?

replace depricated event_loop_policy

Pitfalls

What should the implementer watch out for? What are the risks?