chore: apply `unreachable_pub` lint to crates #1353

Job	Run time
set-msrv / set-msrv	6s
minimal-versions / minimal-versions	1m 13s
cross (stable, powerpc-unknown-linux-gnu, default)	50s
test (stable)	58s
test (1.85.0)	59s
build (1.85.0, wasm32-unknown-unknown)	31s
cross (1.85.0, powerpc-unknown-linux-gnu, default)	45s
cross (stable, aarch64-unknown-linux-gnu, default)	46s
build (1.85.0, thumbv7em-none-eabi)	25s
build (stable, wasm32-unknown-unknown)	24s
cross (1.85.0, aarch64-unknown-linux-gnu, default)	42s
build (stable, thumbv7em-none-eabi)	46s
	8m 25s

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