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Bump third_party/nanopb/repo from `671672b` to `2730f3e` #1213

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 20s
Chef - Linux CI Examples	5m 14s
Chef - Telink CI Examples	11m 59s
Chef - NRFConnect CI Examples	12m 6s
	37m 39s