use numpy random generator instead of randomstate

Is your feature request related to a problem? Please describe.
https://numpy.org/doc/stable/reference/random/legacy.html#numpy.random.RandomState

The RandomState provides access to legacy generators. This generator is considered frozen and will have no further improvements.

https://numpy.org/doc/stable/reference/random/generator.html

The Generator provides access to a wide range of distributions, and served as a replacement for RandomState. The main difference between the two is that Generator relies on an additional BitGenerator to manage state and generate the random bits, which are then transformed into random values from useful distributions. The default BitGenerator used by Generator is PCG64. The BitGenerator can be changed by passing an instantized BitGenerator to Generator.

API differences
https://numpy.org/doc/stable/reference/random/new-or-different.html#new-or-different