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Bump third_party/openthread/repo from `66eaeec` to `f239c49` #403

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Run time

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Job	Run time
Chef - ESP32 CI Examples	14m 39s
Chef - Linux CI Examples	6m 41s
Chef - NRFConnect CI Examples	8m 47s
Chef - Telink CI Examples	7m 35s
	37m 42s