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Bump third_party/pigweed/repo from `c8c31a0` to `9ad961b` #505

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Job	Run time
Chef - ESP32 CI Examples	28m 23s
Chef - NRFConnect CI Examples	16m 25s
Chef - Linux CI Examples	12m 4s
Chef - Telink CI Examples	18m 32s
	1h 15m 24s