Migrate to `hybrid-array`; MSRV 1.65 #388

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	5m 1s
build (1.65.0, wasm32-unknown-unknown)	3m 38s
build (stable, thumbv7em-none-eabi)	25s
build (stable, wasm32-unknown-unknown)	24s
test (1.65.0)	3m 35s
test (stable)	21s
minimal-versions / minimal-versions	26s
	13m 50s

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