asyncio: update cancels for py39 (#4135)

Co-authored-by: hauntsaninja <>

tests/stubtest_whitelists/py39.txt

@@ -16,18 +16,14 @@ ast.Str.__new__
 asyncio.AbstractEventLoop.sock_sendfile
 asyncio.Future.__init__
 asyncio.Future._callbacks
-asyncio.Future.cancel
 asyncio.Handle.__init__
-asyncio.Task.cancel
 asyncio.TimerHandle.__init__
 asyncio.events.AbstractEventLoop.sock_sendfile
 asyncio.events.Handle.__init__
 asyncio.events.TimerHandle.__init__
 asyncio.futures.Future.__init__
 asyncio.futures.Future._callbacks
-asyncio.futures.Future.cancel
 asyncio.proactor_events._ProactorBasePipeTransport.__del__
-asyncio.tasks.Task.cancel
 builtins.bytearray.extend
 builtins.bytearray.pop
 builtins.compile