sec1: migrate from `generic-array` to `hybrid-array` #860

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 48s
test (1.65.0)	1m 56s
build (1.65.0, wasm32-unknown-unknown)	1m 48s
build (stable, thumbv7em-none-eabi)	24s
test (stable)	28s
build (stable, wasm32-unknown-unknown)	24s
minimal-versions / minimal-versions	39s
	7m 27s

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