Cut new prereleases (#2262) #2772

Job	Run time
test (stable)	21s
build (stable, thumbv7em-none-eabi)	13s
build (1.85.0, thumbv7em-none-eabi)	15s
test (1.85.0)	22s
build (stable, wasm32-unknown-unknown)	10s
build (1.85.0, wasm32-unknown-unknown)	19s
	1m 40s

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