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Bump third_party/nanopb/repo from `5fd8f04` to `423c03b` #503

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Run time

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Job	Run time
Chef - ESP32 CI Examples	44m 39s
Chef - NRFConnect CI Examples	33m 54s
Chef - Linux CI Examples	15m 1s
Chef - Telink CI Examples	7m 40s
	1h 41m 14s