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Bump third_party/ot-br-posix/repo from `23149c3` to `6d70f5e` #66533

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Run time

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Job	Run time
Chef - Linux CI Examples	9m 34s
Chef - ESP32 CI Examples	13m 12s
Chef - NRFConnect CI Examples	6m 39s
Chef - Telink CI Examples	10m 21s
	39m 46s