build(deps): update rand_core requirement from 0.6 to 0.9 #1551

Job	Run time
build with default features	34s
build with MSRV (1.66.1)	3m 27s
actionlint	5s
build with no_std (ristretto255)	14s
Clippy	26s
Check Rust doc	26s
build with no_std (ed25519)	13s
Rustfmt	8s
build with no_std (p256)	14s
build with no_std (secp256k1)	18s
Check if automatically generated code is up to date	12s
test on beta	1m 1s
build with no_std (secp256k1-tr)	15s
build with no_std (rerandomized)	18s
	7m 51s

Provide feedback