consider publishing abi3 wheels/relaxing python <3.13 bound

[HikaGenji]

Hi. I noticed that csp currently has a python version upper bound excluding python 3.13+. I would like to use csp with newer python versions. If the upper bound is primarily due to binary extension compatibility, would you consider investigating CPython's stable ABI/abi3 wheels ?

If feasible, it could make future python compatibility easier.

[timkpaine]

#39

[robambalu]

Note support for 3.14 was just merged and should be in the next release: #726