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Bump third_party/openthread/repo from `f0b6fce` to `5bd9de5` #1901

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Run time

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Job	Run time
Chef - Linux CI Examples	5m 57s
Chef - ESP32 CI Examples	6m 45s
Chef - NRFConnect CI Examples	12m 9s
Chef - Telink CI Examples	12m 25s
	37m 16s