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Bump third_party/openthread/repo from `aed9cd1` to `9f9d0a5` #1927

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Run time

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Job	Run time
Chef - Linux CI Examples	5m 54s
Chef - ESP32 CI Examples	11m 54s
Chef - NRFConnect CI Examples	3m 36s
Chef - Telink CI Examples	6m 45s
	28m 9s