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Bump third_party/ot-br-posix/repo from `bd15f71` to `23149c3` #919

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Run time

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Job	Run time
Chef - Linux CI Examples	4m 54s
Chef - ESP32 CI Examples	11m 6s
Chef - NRFConnect CI Examples	9m 23s
Chef - Telink CI Examples	9m 45s
	35m 8s