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Bump third_party/ot-br-posix/repo from `bd15f71` to `3baf160` #278

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Run time

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Job	Run time
Chef - ESP32 CI Examples	8m 47s
Chef - Linux CI Examples	6m 18s
Chef - NRFConnect CI Examples	11m 52s
Chef - Telink CI Examples	12m 8s
	39m 5s