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Bump third_party/ot-br-posix/repo from `9bdaa91` to `4489aa0` #258

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Run time

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Job	Run time
Chef - ESP32 CI Examples	4m 13s
Chef - Linux CI Examples	6m 43s
Chef - NRFConnect CI Examples	8m 7s
Chef - Telink CI Examples	8m 6s
	27m 9s