block-buffer: bump `crypto-common` to v0.2.0-rc.0 #574

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 57s
build (1.65.0, wasm32-unknown-unknown)	1m 57s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	15s
test (1.65.0)	1m 58s
test (stable)	14s
minimal-versions / minimal-versions	22s
	6m 56s

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