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Bump third_party/ot-br-posix/repo from `bd15f71` to `6112f98` #938

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Run time

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Job	Run time
Chef - ESP32 CI Examples	11m 45s
Chef - Linux CI Examples	5m 3s
Chef - Telink CI Examples	6m 45s
Chef - NRFConnect CI Examples	9m 32s
	33m 5s