sec1

sec1: bump `serdect` dependency to v0.3.0-rc.0 #3112

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	34s
build (1.72.0, wasm32-unknown-unknown)	37s
build (stable, thumbv7em-none-eabi)	30s
minimal-versions	0s
build (stable, wasm32-unknown-unknown)	28s
test (1.72.0)	1m 13s
test (stable)	1m 5s
	4m 27s

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