rc6: 2024 edition; upgrade to `cipher` v0.5.0-rc.1 #934

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	1s
build (stable, wasm32-unknown-unknown)	1s
test (1.85.0)	1s
test (stable)	1s
build (1.85.0, thumbv7em-none-eabi)	1m 30s
build (stable, thumbv7em-none-eabi)	1s
minimal-versions	0s
	1m 35s

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