Update pyright (#6840)

stdlib/unittest/mock.pyi

@@ -406,7 +406,7 @@ if sys.version_info >= (3, 8):
         await_args_list: _CallList
     class AsyncMagicMixin(MagicMixin):
         def __init__(self, *args: Any, **kw: Any) -> None: ...
-    class AsyncMock(AsyncMockMixin, AsyncMagicMixin, Mock): ...
+    class AsyncMock(AsyncMockMixin, AsyncMagicMixin, Mock): ...  # type: ignore # argument disparities between base classes
 
 class MagicProxy:
     name: Any