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Bump third_party/openthread/repo from `aed9cd1` to `d7810fa` #297

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 34s
Chef - Linux CI Examples	11m 9s
Chef - Telink CI Examples	11m 40s
Chef - NRFConnect CI Examples	11m 34s
	47m 57s