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Bump third_party/pigweed/repo from `ea93eb5` to `8a6f44e` #265

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Run time

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Job	Run time
Chef - ESP32 CI Examples	3m 39s
Chef - Linux CI Examples	6m 28s
Chef - NRFConnect CI Examples	7m 58s
Chef - Telink CI Examples	7m 45s
	25m 50s