sec1: migrate from `generic-array` to `hybrid-array` #1013

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 31s
build (1.65.0, wasm32-unknown-unknown)	1m 36s
build (stable, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	16s
test (1.65.0)	2m 14s
test (stable)	25s
minimal-versions / minimal-versions	33s
	6m 52s

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