I believe the pymc versions were resolved into developing version 4 of pymc. Development at https://github.com/pymc-devs/pymc
It still depends on theano now evolved and renamed https://aesara.readthedocs.io/en/latest/
Current pyro has a Monte Carlo sampler
https://docs.pyro.ai/en/stable/_modules/pyro/infer/mcmc/nuts...