streebog: fix bit-length counter carry propagation to 512-bit (#759) #28

Job	Run time
minimal-versions / minimal-versions	44s
set-msrv / set-msrv	6s
test (1.85.0)	37s
test (stable)	36s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	20s
build (1.85.0, thumbv7em-none-eabi)	21s
build (1.85.0, wasm32-unknown-unknown)	32s
	3m 34s

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