digest: bump `block-buffer` to v0.11.0-rc.2 (#1678) #1788

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	16s
test (1.81.0)	18s
build (1.81.0, wasm32-unknown-unknown)	24s
test (stable)	15s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	18s
minimal-versions / minimal-versions	27s
	2m 6s

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