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Bump third_party/openthread/repo from `f0b6fce` to `bb5e9b7` #647

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Run time

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Job	Run time
Chef - ESP32 CI Examples	13m 51s
Chef - Linux CI Examples	6m 7s
Chef - NRFConnect CI Examples	11m 37s
Chef - Telink CI Examples	6m 39s
	38m 14s