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Bump third_party/openthread/repo from `f0b6fce` to `518a849` #271

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Run time

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Job	Run time
Chef - Linux CI Examples	6m 38s
Chef - ESP32 CI Examples	3m 55s
Chef - NRFConnect CI Examples	7m 45s
Chef - Telink CI Examples	8m 22s
	26m 40s