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Bump third_party/openthread/repo from `f0b6fce` to `d60aaab` #1613

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Run time

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Job	Run time
Chef - ESP32 CI Examples	14m 30s
Chef - Linux CI Examples	6m 24s
Chef - NRFConnect CI Examples	12m 21s
Chef - Telink CI Examples	6m 38s
	39m 53s