Bump rand version 0.8.3 -> 0.9.0

[Y-jiji]

Currently, I'm working on a vector database project, building specialized hash index for featured data.
To generate a locality sensitive hash, I have to import ndarray-linalg as a dependency.
However, I'm using rand_chacha in a large portion of code already, so the rand crate version has to be 0.9.0.

[Dirreke]

Blocked by rust-num/num-complex#144 and rust-math/cauchy#12