Bump `rand_core` dependency to v0.10.0-rc-2 #141

Job	Run time
Test latest on ubuntu-latest	9s
Test latest on windows-latest	39s
Test MSRV on macOS-latest	20s
Test latest on macOS-latest	14s
Test MSRV on windows-latest	48s
Build target wasm32-wasip1	17s
Test MSRV on ubuntu-latest	14s
Rustfmt	13s
Build target thumbv7em-none-eabihf	15s
Intra-doc links	43s
Build target thumbv6m-none-eabi	16s
	4m 8s

Provide feedback