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Bump third_party/pigweed/repo from `9e4bfb9` to `c3e6813` #797

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Run time

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Job	Run time
Chef - ESP32 CI Examples	12m 16s
Chef - Linux CI Examples	11m 46s
Chef - NRFConnect CI Examples	12m 48s
Chef - Telink CI Examples	11m 34s
	48m 24s