block-buffer: bump `crypto-common` to v0.2.0-rc.0 #1674

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 1s
build (1.65.0, wasm32-unknown-unknown)	2m 3s
test (1.65.0)	2m 4s
build (stable, thumbv7em-none-eabi)	14s
test (stable)	16s
build (stable, wasm32-unknown-unknown)	17s
	6m 55s

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