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Bump third_party/pigweed/repo from `1f12d06` to `76e4c2b` #1917

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Run time

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Job	Run time
Chef - ESP32 CI Examples	2m 31s
Chef - Linux CI Examples	1m 59s
Chef - NRFConnect CI Examples	2m 38s
Chef - Telink CI Examples	2m 30s
	9m 38s