Reject PSS salt lengths that do not fit in a u8 #1308

Job	Run time
test (1.85.0)	3m 11s
test (stable)	4m 49s
build (stable, wasm32-unknown-unknown)	21s
build (stable, thumbv7em-none-eabi)	25s
nightly	1m 5s
build (1.85.0, thumbv7em-none-eabi)	25s
build (1.85.0, wasm32-unknown-unknown)	24s
minimal-versions	0s
	10m 40s

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