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Bump third_party/openthread/repo from `287dbfa` to `b0984af` #1262

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 30s
Chef - Linux CI Examples	5m 40s
Chef - NRFConnect CI Examples	6m 55s
Chef - Telink CI Examples	12m 43s
	33m 48s