Remove references to event loop policies.

[johnzhou721]

No description provided.

[johnzhou721]

Remove myself from credits, obviously.

[hosaka]

This breaks qasync.run, for example with a simple test:

def test_run_with_contextmanager():
    async def coro():
        event_loop = asyncio.get_event_loop()
        assert type(event_loop).__name__ == "QSelectorEventLoop"
        await asyncio.sleep(0)

    qasync.run(coro())

    event_loop = asyncio.get_event_loop()
    assert type(event_loop).__name__ != "QSelectorEventLoop"

While not used internally, or in any example, we probably shouldn't break the run() interface. You're also not passing the argv to QApplication.

It's also worth pointing out that we currently support python 3.8 - 3.12. The event loop policies will be deprecated in 3.14 and removed in 3.16. This doesn't concern qasync currently, until we decided to support 3.14+, by adding it to CI test targets.

[johnzhou721]

@hosaka I've made the requested changes, please review again. Thank you!

[johnzhou721]

@hosaka if we want to support the older event loop policy, I think we can add a version check. Let me know if that is desired.