block-buffer: bump `crypto-common` to v0.2.0-pre.5 #1627

Job	Run time
build (1.57.0, thumbv7em-none-eabi)	16s
build (1.57.0, wasm32-unknown-unknown)	13s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	9s
test (1.57.0)	11s
test (stable)	7s
minimal-versions / minimal-versions	15s
	1m 19s

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