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Bump third_party/openthread/repo from `2aeb8b8` to `854e92a` #414

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Run time

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Job	Run time
Chef - ESP32 CI Examples	6m 23s
Chef - Linux CI Examples	6m 6s
Chef - Telink CI Examples	12m 16s
Chef - NRFConnect CI Examples	12m 16s
	37m 1s