In 3.13.3 we accidentally broke the interface for custom task factory. Factory authors added workarounds.
This PR (for 3.13.4) unbreaks task factories that haven't made a workaround yet while also supporting those that have.
NOTE: The custom task factory API will change to what we accidentally released in 3.13.3.
Co-authored-by: Kumar Aditya <kumaraditya@python.org> Co-authored-by: Guido van Rossum <gvanrossum@gmail.com>