frost-rerandomized: change Randomizer generation #1449

Job	Run time
test on beta	2m 31s
build with MSRV (1.66.1)	1m 44s
build with default features	32s
build with no_std (ristretto255)	22s
build with no_std (ed25519)	23s
build with no_std (p256)	21s
build with no_std (secp256k1)	34s
Clippy	28s
Rustfmt	11s
build with no_std (secp256k1-tr)	25s
build with no_std (rerandomized)	17s
Check if automatically generated code is up to date	27s
actionlint	9s
Check Rust doc	25s
	8m 49s

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