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Bump third_party/openthread/repo from `aed9cd1` to `8418995` #1905

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Run time

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Job	Run time
Chef - ESP32 CI Examples	6m 43s
Chef - Linux CI Examples	6m 14s
Chef - NRFConnect CI Examples	12m 17s
Chef - Telink CI Examples	6m 54s
	32m 8s