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Bump third_party/openthread/repo from `f0b6fce` to `5e34ab2` #1605

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 37s
Chef - Linux CI Examples	6m 10s
Chef - NRFConnect CI Examples	11m 52s
Chef - Telink CI Examples	12m 25s
	39m 4s