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Bump third_party/openthread/repo from `f0b6fce` to `a147485` #666

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Run time

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Job	Run time
Chef - Linux CI Examples	5m 43s
Chef - ESP32 CI Examples	6m 50s
Chef - Telink CI Examples	6m 40s
Chef - NRFConnect CI Examples	11m 37s
	30m 50s