block-buffer: bump `crypto-common` to v0.2.0-rc.0 #1675

Job	Run time
build (1.57.0, thumbv7em-none-eabi)	16s
build (1.57.0, wasm32-unknown-unknown)	13s
test (1.57.0)	18s
build (stable, thumbv7em-none-eabi)	13s
test (stable)	13s
build (stable, wasm32-unknown-unknown)	13s
minimal-versions / minimal-versions	20s
	1m 46s

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