k12

chore: apply `unreachable_pub` lint to crates #1308

Job	Run time
set-msrv / set-msrv	6s
build (stable, thumbv7em-none-eabi)	17s
test (1.85.0)	29s
test (stable)	25s
build (1.85.0, thumbv7em-none-eabi)	24s
build (1.85.0, wasm32-unknown-unknown)	25s
build (stable, wasm32-unknown-unknown)	23s
	2m 29s

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