frodo-kem: remove `safe-oqs` #245

Job	Run time
set-msrv / set-msrv	5s
minimal-versions	0s
test (stable)	32s
no_std (1.85.0, thumbv7em-none-eabi)	27s
test (1.85.0)	36s
no_std (1.85.0, wasm32-unknown-unknown)	27s
cross (powerpc-unknown-linux-gnu, stable)	45s
cross (powerpc-unknown-linux-gnu, 1.85.0)	57s
no_std (stable, thumbv7em-none-eabi)	26s
no_std (stable, wasm32-unknown-unknown)	31s
	4m 46s

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