sec1: bump `serdect` dependency to v0.3.0-rc.0 #1572

Job	Run time
build (1.70.0, thumbv7em-none-eabi)	31s
build (1.70.0, wasm32-unknown-unknown)	31s
test (1.70.0)	1m 37s
build (stable, thumbv7em-none-eabi)	22s
test (stable)	1m 13s
build (stable, wasm32-unknown-unknown)	22s
minimal-versions / minimal-versions	1m 8s
	5m 44s

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