serdect: bump version to v0.3.0-pre #2472

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	6m 54s
build (1.65.0, wasm32-unknown-unknown)	6m 41s
build (stable, thumbv7em-none-eabi)	2m 3s
build (stable, wasm32-unknown-unknown)	2m 37s
derive (1.65.0)	5m 52s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.65.0, sudo apt update && sudo apt install gcc-mult...	31m 23s
derive (stable)	25s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	21m 38s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.65.0)	25m 35s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	16m 40s
minimal-versions / minimal-versions	19m 28s
	2h 19m 16s

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