p521

Bump `serdect` to v0.3.0-rc.0 (#1084) #1017

Job	Run time
benches (stable)	1m 5s
build (1.73.0, thumbv7em-none-eabi)	21s
doc	52s
build (1.73.0, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	18s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 52s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 36s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 24s
test (x86_64-unknown-linux-gnu, stable)	1m 15s
	9m 22s

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