k12

Cut prereleases with `hybrid-array` v0.4 support #1293

Job	Run time
set-msrv / set-msrv	3s
build (stable, wasm32-unknown-unknown)	26s
build (1.85.0, thumbv7em-none-eabi)	23s
build (1.85.0, wasm32-unknown-unknown)	23s
build (stable, thumbv7em-none-eabi)	14s
test (stable)	22s
test (1.85.0)	22s
	2m 13s

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