hkdf

bake-kdf: bump `belt-hash` dependency to v0.2 (#197) #376

Job	Run time
build (stable, wasm32-unknown-unknown)	21s
test (stable)	26s
build (1.85.0, thumbv7em-none-eabi)	18s
minimal-versions / minimal-versions	29s
test (1.85.0)	30s
build (1.85.0, wasm32-unknown-unknown)	16s
build (stable, thumbv7em-none-eabi)	18s
	2m 38s

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