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Bump third_party/pigweed/repo from `1f12d06` to `8512b20` #1870

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 21s
Chef - Linux CI Examples	11m 1s
Chef - NRFConnect CI Examples	12m 38s
Chef - Telink CI Examples	11m 53s
	48m 53s