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Bump third_party/ot-br-posix/repo from `9bdaa91` to `4489aa0` #257

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Job	Run time
Chef - Linux CI Examples	6m 30s
Chef - ESP32 CI Examples	3m 36s
Chef - NRFConnect CI Examples	7m 56s
Chef - Telink CI Examples	7m 58s
	26m 0s