CI: use `rustsec/audit-check@v2` (#1093) #2040

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	40s
build (1.73.0, wasm32-unknown-unknown)	45s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 43s
build (stable, thumbv7em-none-eabi)	35s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 26s
build (stable, wasm32-unknown-unknown)	32s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 30s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 49s
cross (aarch64-unknown-linux-gnu, stable)	1m 11s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 34s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 33s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 24s
cross (powerpc-unknown-linux-gnu, stable)	1m 17s
test (x86_64-unknown-linux-gnu, stable)	1m 12s
doc	54s
	18m 5s

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