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Bump third_party/openthread/repo from `b78b71b` to `d81c6fa` #490

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 55s
Chef - Linux CI Examples	6m 32s
Chef - NRFConnect CI Examples	7m 51s
Chef - Telink CI Examples	7m 33s
	30m 51s