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Bump third_party/openthread/repo from `2aeb8b8` to `5bd9de5` #1674

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 46s
Chef - NRFConnect CI Examples	11m 55s
Chef - Linux CI Examples	6m 26s
Chef - Telink CI Examples	6m 54s
	34m 1s