digest: bump `block-buffer` to v0.11.0-rc.2 #2898

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	40s
test (1.81.0)	27s
build (1.81.0, wasm32-unknown-unknown)	40s
minimal-versions	0s
test (stable)	32s
build (stable, thumbv7em-none-eabi)	43s
test (nightly)	33s
build (stable, wasm32-unknown-unknown)	46s
	4m 21s

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