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Bump third_party/pigweed/repo from `c8c31a0` to `39aca01` #496

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 21s
Chef - Linux CI Examples	6m 22s
Chef - NRFConnect CI Examples	7m 41s
Chef - Telink CI Examples	7m 46s
	31m 10s