update release checklist; misc cleanups #1528

# to view logs

Job	Run time
build with default features	31s
actionlint	6s
build with MSRV (1.66.1)	2m 47s
build with no_std (ristretto255)	25s
Clippy	35s
build with no_std (ed25519)	29s
Check Rust doc	24s
Rustfmt	6s
build with no_std (p256)	27s
Check if automatically generated code is up to date	28s
build with no_std (secp256k1)	28s
test on beta	2m 24s
build with no_std (secp256k1-tr)	28s
build with no_std (rerandomized)	23s
	10m 1s

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