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Bump third_party/openthread/repo from `f0b6fce` to `39fcc5e` #263

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Run time

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Job	Run time
Chef - ESP32 CI Examples	3m 52s
Chef - NRFConnect CI Examples	7m 54s
Chef - Linux CI Examples	6m 27s
Chef - Telink CI Examples	9m 10s
	27m 23s