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Bump third_party/ot-br-posix/repo from `bd15f71` to `b852388` #935

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Run time

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Job	Run time
Chef - ESP32 CI Examples	1m 5s
Chef - Linux CI Examples	4m 50s
Chef - NRFConnect CI Examples	1m 35s
Chef - Telink CI Examples	1m 31s
	9m 1s