sec1: migrate from `generic-array` to `hybrid-array` #861

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 48s
build (1.65.0, wasm32-unknown-unknown)	1m 41s
test (1.65.0)	1m 47s
build (stable, thumbv7em-none-eabi)	25s
test (stable)	28s
build (stable, wasm32-unknown-unknown)	23s
minimal-versions / minimal-versions	32s
	7m 4s

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