bp384

Bump `serdect` to v0.3.0-rc.0 (#1084) #1403

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	32s
test (1.73.0)	36s
doc	43s
build (1.73.0, wasm32-unknown-unknown)	31s
test (stable)	28s
build (stable, thumbv7em-none-eabi)	32s
build (stable, wasm32-unknown-unknown)	24s
	3m 46s

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