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Bump third_party/pigweed/repo from `ea93eb5` to `8a6f44e` #266

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Run time

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Job	Run time
Chef - ESP32 CI Examples	3m 52s
Chef - Linux CI Examples	6m 59s
Chef - Telink CI Examples	8m 22s
Chef - NRFConnect CI Examples	7m 49s
	27m 2s