* CI: remove cython3 beta testing Cython 3.0.0 was released: https://cython.readthedocs.io/en/latest/src/changes.html * CI: remove duplicate run
* CI: remove cython3 beta testing Cython 3.0.0 was released: https://cython.readthedocs.io/en/latest/src/changes.html * CI: remove duplicate run