chore: apply `unreachable_pub` lint to crates #1319

Job	Run time
set-msrv / set-msrv	5s
minimal-versions / minimal-versions	48s
test (stable)	46s
build (1.85.0, wasm32-unknown-unknown)	25s
build (1.85.0, thumbv7em-none-eabi)	24s
test (1.85.0)	43s
build (stable, wasm32-unknown-unknown)	31s
build (stable, thumbv7em-none-eabi)	19s
	4m 1s

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