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Bump third_party/openthread/repo from `aed9cd1` to `6bc9309` #1916

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Run time

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Job	Run time
Chef - ESP32 CI Examples	6m 39s
Chef - Linux CI Examples	6m 26s
Chef - NRFConnect CI Examples	11m 41s
Chef - Telink CI Examples	11m 42s
	36m 28s