rc5

Bump `cipher` to v0.5.0-pre.1; MSRV 1.65 #101

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 18s
build (1.65.0, wasm32-unknown-unknown)	1m 20s
test (1.65.0)	1m 28s
build (stable, thumbv7em-none-eabi)	19s
test (stable)	17s
build (stable, wasm32-unknown-unknown)	17s
minimal-versions / minimal-versions	12s
	5m 11s

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