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Bump third_party/openthread/repo from `287dbfa` to `c13fcc6` #1270

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Run time

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Job	Run time
Chef - ESP32 CI Examples	14m 18s
Chef - Linux CI Examples	5m 35s
Chef - NRFConnect CI Examples	6m 53s
Chef - Telink CI Examples	12m 16s
	39m 2s