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Bump third_party/openthread/repo from `f0b6fce` to `7b72e97` #1932

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Run time

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Job	Run time
Chef - ESP32 CI Examples	6m 57s
Chef - Linux CI Examples	5m 55s
Chef - NRFConnect CI Examples	7m 11s
Chef - Telink CI Examples	16m 35s
	36m 38s