ssh-key: bump `dsa` and `rsa` #744

Job	Run time
test (1.85.0)	55s
test (stable)	55s
minimal-versions / minimal-versions	37s
no_std (1.85.0, thumbv7em-none-eabi)	34s
no_std (1.85.0, wasm32-unknown-unknown)	32s
no_std (stable, wasm32-unknown-unknown)	32s
no_std (stable, thumbv7em-none-eabi)	35s
	4m 40s

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