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Bump third_party/openthread/repo from `0b269e1` to `f31a583` #835

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Run time

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Job	Run time
Chef - ESP32 CI Examples	12m 29s
Chef - Linux CI Examples	11m 0s
Chef - NRFConnect CI Examples	12m 57s
Chef - Telink CI Examples	13m 16s
	49m 42s