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Bump third_party/openthread/repo from `287dbfa` to `90ced56` #1957

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 59s
Chef - Linux CI Examples	5m 42s
Chef - NRFConnect CI Examples	7m 20s
Chef - Telink CI Examples	7m 21s
	29m 22s