sha2

chore: apply `unreachable_pub` lint to crates #1529

Job	Run time
riscv64-zknh	1m 1s
riscv32-zknh	1m 11s
set-msrv / set-msrv	1m 44s
minimal-versions / minimal-versions	1s
build	1s
macos	1s
cross	1s
linux	1s
wasm	1s
windows	1s
	4m 3s

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