fix(benchmark): adapt callback benchmark to lib conditions (aio-libs#710)

Author: BobTheBuidler

benchmark.py

@@ -1,4 +1,5 @@
 import asyncio
+from functools import partial
 from typing import Any, Callable
 
 import pytest
@@ -305,9 +306,10 @@ async def dummy_coro():
 
     iterations = range(1000)
     create_future = loop.create_future
-    callback = func._task_done_callback
+    callback_fn = func._task_done_callback
 
     @benchmark
     def run() -> None:
         for i in iterations:
-            callback(create_future(), i, task)
+            callback = partial(callback_fn, create_future(), i)
+            callback(task)