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Bump third_party/openthread/repo from `aed9cd1` to `9277bce` #1859

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Run time

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Job	Run time
Chef - ESP32 CI Examples	7m 5s
Chef - Linux CI Examples	6m 20s
Chef - Telink CI Examples	11m 44s
Chef - NRFConnect CI Examples	6m 36s
	31m 45s