Test failure with Python 3.10

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Describe the bug

============================= test session starts ==============================
platform linux -- Python 3.10.1, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
rootdir: /build/transitions-0.8.10, configfile: pytest.ini
collected 2463 items                                                           

tests/test_add_remove.py ...                                             [  0%]
tests/test_async.py ..................................F

=================================== FAILURES ===================================
________________________ TestAsync.test_multiple_models ________________________

self = <tests.test_async.TestAsync testMethod=test_multiple_models>

    def test_multiple_models(self):
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)

        m1 = self.machine_cls(states=['A', 'B', 'C'], initial='A', name="m1")
        m2 = self.machine_cls(states=['A'], initial='A', name='m2')
        m1.add_transition(trigger='go', source='A', dest='B', before=self.cancel_soon)
        m1.add_transition(trigger='fix', source='A', dest='C', after=self.cancel_soon)
        m1.add_transition(trigger='check', source='C', dest='B', conditions=self.await_false)
        m1.add_transition(trigger='reset', source='C', dest='A')
        m2.add_transition(trigger='go', source='A', dest=None, conditions=m1.is_C, after=m1.reset)

>       loop.run_until_complete(asyncio.gather(m1.go(),  # should block before B
                                               self.call_delayed(m1.fix, 0.05),  # should cancel task and go to C
                                               self.call_delayed(m1.check, 0.07),  # should exit before m1.fix
                                               self.call_delayed(m2.go, 0.1)))  # should cancel m1.fix

tests/test_async.py:144: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/nix/store/b798fp24zf2fdafmyyc4sxfr48ly5yy9-python3-3.10.1/lib/python3.10/asyncio/tasks.py:776: in gather
    fut = _ensure_future(arg, loop=loop)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

coro_or_future = <coroutine object AsyncEvent.trigger at 0x7ffff58bfc30>

    def _ensure_future(coro_or_future, *, loop=None):
        if futures.isfuture(coro_or_future):
            if loop is not None and loop is not futures._get_loop(coro_or_future):
                raise ValueError('The future belongs to a different loop than '
                                'the one specified as the loop argument')
            return coro_or_future

        if not coroutines.iscoroutine(coro_or_future):
            if inspect.isawaitable(coro_or_future):
                coro_or_future = _wrap_awaitable(coro_or_future)
            else:
                raise TypeError('An asyncio.Future, a coroutine or an awaitable '
                                'is required')

        if loop is None:
>           loop = events._get_event_loop(stacklevel=4)
E           DeprecationWarning: There is no current event loop

/nix/store/b798fp24zf2fdafmyyc4sxfr48ly5yy9-python3-3.10.1/lib/python3.10/asyncio/tasks.py:633: DeprecationWarning
=========================== short test summary info ============================
FAILED tests/test_async.py::TestAsync::test_multiple_models - DeprecationWarn...
!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!
========================= 1 failed, 37 passed in 2.41s =========================

Minimal working example

n/a

Expected behavior Tests to pass.

Additional context https://docs.python.org/3.10/library/asyncio-eventloop.html#asyncio.get_event_loop

pytransitions / transitions

Test failure with Python 3.10 #563