sm2

Bump `serdect` to v0.3.0-rc.0 (#1084) #445

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	29s
build (1.73.0, wasm32-unknown-unknown)	24s
build (stable, thumbv7em-none-eabi)	22s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 8s
build (stable, wasm32-unknown-unknown)	20s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 2s
test (x86_64-unknown-linux-gnu, 1.73.0)	50s
test (x86_64-unknown-linux-gnu, stable)	38s
doc	1m 6s
	6m 19s

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