ci: move `cross-tests` action (#699) #468

Job	Run time
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	6s
test (1.85.0)	30s
build (1.85.0, thumbv7em-none-eabi)	26s
build (stable, thumbv7em-none-eabi)	27s
build (1.85.0, wasm32-unknown-unknown)	25s
build (stable, wasm32-unknown-unknown)	22s
test (stable)	21s
	3m 13s

Provide feedback