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Bump third_party/openthread/repo from `f0b6fce` to `fb7b457` #270

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 18s
Chef - Linux CI Examples	5m 48s
Chef - NRFConnect CI Examples	6m 30s
Chef - Telink CI Examples	7m 4s
	27m 40s