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Bump third_party/openthread/repo from `2aeb8b8` to `ff19e03` #399

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Run time

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Job	Run time
Chef - ESP32 CI Examples	6m 35s
Chef - Linux CI Examples	5m 43s
Chef - NRFConnect CI Examples	6m 52s
Chef - Telink CI Examples	12m 42s
	31m 52s