CI: use `rustsec/audit-check@v2` (#1093) #740

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	20s
doc	43s
build (1.73.0, wasm32-unknown-unknown)	22s
test (1.73.0)	29s
build (stable, thumbv7em-none-eabi)	14s
test (stable)	18s
build (stable, wasm32-unknown-unknown)	15s
	2m 41s

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