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Bump third_party/openthread/repo from `aed9cd1` to `db63932` #282

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 4s
Chef - Linux CI Examples	5m 43s
Chef - NRFConnect CI Examples	6m 46s
Chef - Telink CI Examples	7m 2s
	28m 35s