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Bump third_party/pigweed/repo from `d5fcc90` to `8b3ecac` #313

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 27s
Chef - Linux CI Examples	10m 36s
Chef - NRFConnect CI Examples	12m 5s
Chef - Telink CI Examples	11m 53s
	48m 1s