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Bump third_party/pigweed/repo from `1f12d06` to `8512b20` #1143

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 43s
Chef - NRFConnect CI Examples	12m 0s
Chef - Telink CI Examples	11m 43s
Chef - Linux CI Examples	11m 2s
	48m 28s