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Bump third_party/openthread/repo from `266a97b` to `666a9bd` #490

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 1s
Chef - Linux CI Examples	6m 37s
Chef - NRFConnect CI Examples	8m 1s
Chef - Telink CI Examples	8m 8s
	31m 47s