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Bump third_party/openthread/repo from `a8afffb` to `19af711` #436

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 6s
Chef - Linux CI Examples	6m 48s
Chef - NRFConnect CI Examples	7m 55s
Chef - Telink CI Examples	9m 5s
	32m 54s