bpo-42195: Ensure consistency of Callable's __args__ in collections.abc and typing (GH-23060)

diff --git a/Lib/collections/abc.py b/Lib/collections/abc.py
index 891600d..86ca8b8 100644
--- a/Lib/collections/abc.py
+++ b/Lib/collections/abc.py
@@ -1,2 +1,3 @@
 from _collections_abc import *
 from _collections_abc import __all__
+from _collections_abc import _CallableGenericAlias