rc6: 2024 edition; upgrade to `cipher` v0.5.0-rc.1 #936

Job	Run time
test (1.85.0)	21s
test (stable)	29s
build (stable, wasm32-unknown-unknown)	18s
build (1.85.0, thumbv7em-none-eabi)	20s
build (stable, thumbv7em-none-eabi)	15s
build (1.85.0, wasm32-unknown-unknown)	18s
minimal-versions	0s
	2m 1s

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