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Bump third_party/openthread/repo from `d4155e4` to `2ce6e95` #799

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Run time

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Job	Run time
Chef - ESP32 CI Examples	15m 5s
Chef - NRFConnect CI Examples	12m 52s
Chef - Linux CI Examples	8m 54s
Chef - Telink CI Examples	13m 43s
	50m 34s