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Bump third_party/openthread/repo from `f0b6fce` to `e913c7d` #1094

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 37s
Chef - Linux CI Examples	6m 10s
Chef - NRFConnect CI Examples	11m 30s
Chef - Telink CI Examples	6m 42s
	32m 59s