Bump `serdect` to v0.3.0-rc.0 (#1084) #343

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	20s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 47s
build (1.73.0, wasm32-unknown-unknown)	22s
doc	52s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 38s
build (stable, thumbv7em-none-eabi)	13s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 22s
build (stable, wasm32-unknown-unknown)	16s
cross (aarch64-unknown-linux-gnu, stable)	1m 18s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 33s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 26s
cross (powerpc-unknown-linux-gnu, stable)	1m 19s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 30s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 11s
test (x86_64-unknown-linux-gnu, stable)	1m 1s
	16m 8s

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