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Bump third_party/openthread/repo from `266a97b` to `f40eeeb` #493

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 48s
Chef - Linux CI Examples	6m 20s
Chef - NRFConnect CI Examples	8m 4s
Chef - Telink CI Examples	7m 51s
	31m 3s