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Bump third_party/nanopb/repo from `5fd8f04` to `cf26d28` #499

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Run time

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Job	Run time
Chef - Linux CI Examples	6m 30s
Chef - ESP32 CI Examples	9m 22s
Chef - NRFConnect CI Examples	7m 48s
Chef - Telink CI Examples	8m 3s
	31m 43s