md5

Migrate to const blobby parsing #1110

Job	Run time
set-msrv / set-msrv	5s
minimal-versions / minimal-versions	1m 16s
test (1.85.0)	36s
test (stable)	45s
build (1.85.0, thumbv7em-none-eabi)	22s
build (stable, thumbv7em-none-eabi)	14s
build (1.85.0, loongarch64-unknown-linux-gnu)	25s
build (stable, loongarch64-unknown-linux-gnu)	24s
build (stable, wasm32-unknown-unknown)	19s
build (1.85.0, wasm32-unknown-unknown)	26s
	4m 52s

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