Cut new prereleases (#531) #419

Job	Run time
build (stable, thumbv7em-none-eabi)	16s
build (1.85.0, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	14s
test (1.85.0)	22s
test (stable)	23s
build (1.85.0, wasm32-unknown-unknown)	20s
minimal-versions	-1s
	1m 52s

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