According to the very link you provide, the sticking point was a dependency which does not use rust, and the maintainer probably being busy.

I updated a rust-implemented wheel to 3.13 compat myself and literally all that required was bumping pyo3 (which added support back in June) and adding the classifier. Afaik cryptography had no trouble either, iirc what they had to wait on was a 3.13 compatible cffi .