chore: apply `unreachable_pub` lint to crates (#734) #1326

Job	Run time
set-msrv / set-msrv	6s
minimal-versions / minimal-versions	34s
test (1.85.0)	32s
build (1.85.0, wasm32-unknown-unknown)	28s
build (stable, thumbv7em-none-eabi)	30s
test (stable)	49s
build (1.85.0, thumbv7em-none-eabi)	23s
build (stable, wasm32-unknown-unknown)	29s
	3m 51s

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