Upgrade rand_pcg from 0.3.1 to 0.9.0

[dannywillems]

Summary

Upgrade the rand_pcg dependency from version 0.3.1 to 0.9.0.

Related PR

• Bump rand_pcg from 0.3.1 to 0.9.0 #1772

Parent Issue

• [Features parity] Dependencies #1817

Details

This is a major version upgrade that includes:

• MSRV bump to 1.63.0
• Update to rand_core v0.9.0
• Various API changes to rand_core traits
• Feature renames (serde1 to serde, getrandom to os_rng)

See the rand 0.9.0 upgrade guide for migration details.