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Bump third_party/openthread/repo from `786bd7f` to `66eaeec` #897

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Run time

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Job	Run time
Chef - ESP32 CI Examples	11m 43s
Chef - Linux CI Examples	11m 14s
Chef - NRFConnect CI Examples	13m 3s
Chef - Telink CI Examples	14m 4s
	50m 4s