p521

CI: bump `cargo-audit` to v0.20 (#1090) #1024

Job	Run time
benches (stable)	1m 8s
build (1.73.0, thumbv7em-none-eabi)	23s
doc	53s
build (1.73.0, wasm32-unknown-unknown)	20s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	2m 2s
build (stable, thumbv7em-none-eabi)	14s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 35s
build (stable, wasm32-unknown-unknown)	16s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 25s
test (x86_64-unknown-linux-gnu, stable)	1m 19s
	9m 35s

Provide feedback