ci: move `cross-tests` action (#699) #615

Job	Run time
minimal-versions / minimal-versions	49s
set-msrv / set-msrv	4s
test (1.85.0)	32s
build (1.85.0, thumbv7em-none-eabi)	25s
build (stable, thumbv7em-none-eabi)	30s
build (stable, wasm32-unknown-unknown)	27s
test (stable)	38s
build (1.85.0, wasm32-unknown-unknown)	24s
	3m 49s

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