sec1: bump `serdect` dependency to v0.3.0-rc.0 (#1523) #1573

Job	Run time
build (1.70.0, thumbv7em-none-eabi)	37s
build (1.70.0, wasm32-unknown-unknown)	35s
test (1.70.0)	1m 35s
test (stable)	1m 14s
build (stable, thumbv7em-none-eabi)	23s
build (stable, wasm32-unknown-unknown)	27s
minimal-versions / minimal-versions	1m 11s
	6m 2s

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