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Bump third_party/openthread/repo from `266a97b` to `f1e74a0` #511

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Run time

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Job	Run time
Chef - ESP32 CI Examples	9m 15s
Chef - Linux CI Examples	6m 31s
Chef - NRFConnect CI Examples	8m 57s
Chef - Telink CI Examples	7m 51s
	32m 34s