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Bump third_party/openthread/repo from `786bd7f` to `66eaeec` #898

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Run time

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Job	Run time
Chef - ESP32 CI Examples	14m 30s
Chef - Linux CI Examples	10m 15s
Chef - NRFConnect CI Examples	12m 26s
Chef - Telink CI Examples	11m 3s
	48m 14s