CI: use `rustsec/audit-check@v2` (#1093) #2127

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	44s
build (1.73.0, wasm32-unknown-unknown)	44s
build (stable, thumbv7em-none-eabi)	40s
build (stable, wasm32-unknown-unknown)	34s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 34s
doc	53s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 22s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 26s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 53s
cross (aarch64-unknown-linux-gnu, stable)	1m 10s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 48s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 33s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 33s
cross (powerpc-unknown-linux-gnu, stable)	1m 14s
test (x86_64-unknown-linux-gnu, stable)	1m 20s
	18m 28s

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