Fix compatibility with Python 3.11 and newer.
Replace the removed inspect.getargspec() function with
inspect.getfullargspec() to determine the number of positional
arguments accepted by the decorated function.
--- ../oauth2client/_helpers.py	2026-10-16 17:39:27.236181663 +0300
+++ ../oauth2client?_helpers.py	2026-10-16 17:39:54.529323938 +0300
@@ -136,7 +136,8 @@
     if isinstance(max_positional_args, six.integer_types):
         return positional_decorator
     else:
-        args, _, _, defaults = inspect.getargspec(max_positional_args)
+        spec = inspect.getfullargspec(max_positional_args)
+        args, defaults = spec.args, spec.defaults
         return positional(len(args) - len(defaults))(max_positional_args)