dhkem

CI: fix `frodo-kem` (#84) #102

Job	Run time
minimal-versions	0s
set-msrv / set-msrv	6s
cross (powerpc-unknown-linux-gnu, 1.74.0)	50s
cross (powerpc-unknown-linux-gnu, stable)	54s
no_std (1.74.0, thumbv7em-none-eabi)	17s
test (1.74.0)	24s
no_std (1.74.0, wasm32-unknown-unknown)	17s
test (stable)	25s
no_std (stable, thumbv7em-none-eabi)	19s
no_std (stable, wasm32-unknown-unknown)	20s
	3m 52s

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