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Bump third_party/openthread/repo from `f0530af` to `c6eaeda` #814

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Run time

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Job	Run time
Chef - ESP32 CI Examples	17m 9s
Chef - Linux CI Examples	9m 6s
Chef - NRFConnect CI Examples	14m 53s
Chef - Telink CI Examples	14m 14s
	55m 22s