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Bump third_party/ot-br-posix/repo from `bd15f71` to `9ca3b36` #1889

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Run time

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Job	Run time
Chef - Linux CI Examples	5m 38s
Chef - ESP32 CI Examples	9m 2s
Chef - NRFConnect CI Examples	6m 17s
Chef - Telink CI Examples	7m 5s
	28m 2s