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Bump third_party/nanopb/repo from `5fd8f04` to `423c03b` #504

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Run time

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Job	Run time
Chef - ESP32 CI Examples	16m 23s
Chef - Linux CI Examples	47m 39s
Chef - NRFConnect CI Examples	56m 18s
Chef - Telink CI Examples	54m 58s
	2h 55m 18s