hghave: add py312 and py313
While not required in the core test suite in the moment, these could be useful
in the future or for extensions. For example, Python 3.12 removed distutils and
it might make sense to differentiate based on that.
Greg Ward, author of the original bfiles extension
Na'Tosha Bard of Unity Technologies
Fog Creek Software
Special thanks to the University of Toronto and the UCOSP program