fsb

CI: fix `sha2` build (#623) #683

Job	Run time
minimal-versions / minimal-versions	48s
set-msrv / set-msrv	3s
test (1.71.0)	50s
build (1.71.0, thumbv7em-none-eabi)	18s
test (stable)	50s
build (1.71.0, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	19s
	3m 41s

Provide feedback