userinfo_async broken in 4.6.0 #558

Checklist

• I have looked into the Readme and Examples, and have not found a suitable solution or answer.
• I have looked into the API documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Description

await userinfo_async doesn't properly resolve the coroutine.

Reproduction

`
from auth0.asyncify import asyncify
from auth0.authentication import Users as AuthUsers

U = asyncify(AuthUsers)
u = U(domain=AUTH0_DOMAIN)
user_info = await u.userinfo_async(token)
`

Additional context

Works fine with 4.5.0

auth0-python version

4.6.0

Python version

3.11.4