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CI: bump `cargo-audit` to v0.20 (#1090) #2123

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	42s
build (1.73.0, wasm32-unknown-unknown)	42s
build (stable, thumbv7em-none-eabi)	46s
build (stable, wasm32-unknown-unknown)	32s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 47s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 35s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 36s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 30s
doc	54s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 26s
test (x86_64-unknown-linux-gnu, stable)	1m 16s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 23s
cross (aarch64-unknown-linux-gnu, stable)	1m 13s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 25s
cross (powerpc-unknown-linux-gnu, stable)	1m 14s
	18m 1s

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