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Bump third_party/openthread/repo from `2aeb8b8` to `6e46e2e` #341

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 18s
Chef - Linux CI Examples	6m 35s
Chef - NRFConnect CI Examples	11m 47s
Chef - Telink CI Examples	11m 32s
	38m 12s