md2

CI: fix `sha2` build (#623) #1032

Job	Run time
minimal-versions / minimal-versions	47s
set-msrv / set-msrv	6s
test (1.71.0)	48s
build (1.71.0, thumbv7em-none-eabi)	18s
test (stable)	43s
build (1.71.0, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	26s
build (stable, wasm32-unknown-unknown)	12s
	3m 40s

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