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Bump third_party/openthread/repo from `f0b6fce` to `df757ba` #1587

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Run time

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Job	Run time
Chef - Linux CI Examples	11m 16s
Chef - ESP32 CI Examples	14m 13s
Chef - Telink CI Examples	12m 6s
Chef - NRFConnect CI Examples	11m 47s
	49m 22s