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Bump third_party/openthread/repo from `2aeb8b8` to `b42be4c` #312

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 6s
Chef - Linux CI Examples	5m 27s
Chef - NRFConnect CI Examples	6m 30s
Chef - Telink CI Examples	11m 20s
	31m 23s