uvloop test will break in Python 3.16

[crusaderky]

get_event_loop_policy and set_event_loop_policy are deprecated in Python 3.14 and will be removed in 3.16.
https://docs.python.org/3.15/library/asyncio-policy.html#asyncio.get_event_loop_policy

This test will break:

distributed/distributed/tests/test_config.py

Lines 354 to 364 in 274248a

	def test_uvloop_event_loop():
	"""Check that configuring distributed to use uvloop actually sets the event loop policy"""
	pytest.importorskip("uvloop")
	script = (
	"import distributed, asyncio, uvloop\n"
	"assert isinstance(asyncio.get_event_loop_policy(), uvloop.EventLoopPolicy)"
	)
	subprocess.check_call(
	[sys.executable, "-c", script],
	env={"DASK_DISTRIBUTED__ADMIN__EVENT_LOOP": "uvloop"},
	)