CI: use `rustsec/audit-check@v2` (#1093) #133

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	11s
build (1.73.0, wasm32-unknown-unknown)	15s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	10s
doc	15s
test (1.73.0)	11s
test (stable)	14s
	1m 27s

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