sec1: bump `serdect` dependency to v0.3.0-rc.0 (#1523) #1377

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	48s
build (1.65.0, wasm32-unknown-unknown)	49s
build (stable, thumbv7em-none-eabi)	16s
test (1.65.0)	1m 6s
build (stable, wasm32-unknown-unknown)	12s
test (stable)	22s
minimal-versions / minimal-versions	32s
	4m 5s

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