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CI: bump `cargo-audit` to v0.20 (#622) #1110

Job	Run time
cross (1.72.0, aarch64-unknown-linux-gnu, default)	37s
cross (1.72.0, powerpc-unknown-linux-gnu, default)	35s
cross (stable, aarch64-unknown-linux-gnu, default)	30s
cross (stable, powerpc-unknown-linux-gnu, default)	31s
minimal-versions / minimal-versions	34s
set-msrv / set-msrv	5s
linux (x86_64-unknown-linux-gnu, 1.72.0)	36s
macos (1.72.0)	30s
build (1.72.0, thumbv7em-none-eabi)	27s
linux (x86_64-unknown-linux-gnu, stable)	30s
macos (stable)	22s
build (1.72.0, wasm32-unknown-unknown)	18s
build (1.72.0, loongarch64-unknown-linux-gnu)	22s
build (stable, thumbv7em-none-eabi)	19s
windows (x86_64-pc-windows-gnu, 1.72.0)	58s
build (stable, wasm32-unknown-unknown)	13s
windows (x86_64-pc-windows-gnu, stable)	1m 33s
build (stable, loongarch64-unknown-linux-gnu)	13s
	9m 13s

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