sec1: migrate from `generic-array` to `hybrid-array` (#1298) #822

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 46s
build (1.65.0, wasm32-unknown-unknown)	1m 46s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	29s
test (1.65.0)	2m 2s
test (stable)	32s
minimal-versions / minimal-versions	38s
	7m 37s

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