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Bump third_party/openthread/repo from `aed9cd1` to `7f81453` #545

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Run time

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Job	Run time
Chef - ESP32 CI Examples	11m 37s
Chef - Linux CI Examples	6m 3s
Chef - NRFConnect CI Examples	7m 11s
Chef - Telink CI Examples	6m 59s
	31m 50s