Migrate to the new blobby format (#503) #922

Job	Run time
test (1.85.0)	23s
build (stable, thumbv7em-none-eabi)	16s
test (stable)	24s
build (1.85.0, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	18s
build (1.85.0, wasm32-unknown-unknown)	20s
minimal-versions	0s
	1m 58s

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