hmac: bump `digest` to v0.11.0-pre.3; MSRV 1.71 (#150) #83

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	1m 46s
build (1.56.0, thumbv7em-none-eabi)	1m 46s
build (1.56.0, wasm32-unknown-unknown)	1m 46s
build (1.56.0, wasm32-unknown-unknown)	1m 46s
build (stable, thumbv7em-none-eabi)	32s
build (stable, thumbv7em-none-eabi)	32s
build (stable, wasm32-unknown-unknown)	17s
build (stable, wasm32-unknown-unknown)	17s
test (1.56.0)	2s
test (1.56.0)	1m 49s
test (stable)	2s
test (stable)	18s
minimal-versions / minimal-versions	2s
minimal-versions / minimal-versions	31s
	11m 26s

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